Compared to a lot of other utility forms i'm not sure the beatle stacks up. Most of all is this pinch failure rate intended? Here is a snippet of a fight.

Mursa's punch MUTILATES a large guard!

<347hp 226m 187mv 1666tnl (84.13%)> <36 Arial A-P> Khratetch the Knight of the Apocalypse
*31 Human Shf* (PK) Istihl the Master of Levitation
<31 H-Elf Asn> (PK) Mursa the Ippon Seinage
<33 Human Nec> (PK) Orumaen the Greater Golem Maker
<24 Felar War> (PK) Cgragk the Knight
<30 Human Thi> (PK) Blitterskip the Elder Thief
<29 Human Bar> (PK) Tormin the Songsmith, Sheathed Blade
<36 Arial War> Xarius the Victorious Champion

Players found: 8

<347hp 226m 187mv 1666tnl (84.13%)>
Tormin sings 'Ah! the voice of by gone days
Will come back again,
Whispering to the weary hearted
Many a soothing strain.'

The solemn melody gently numbs your pain.

<347hp 226m 187mv 1666tnl (84.13%)> p
A diseased human shivers and suffers.
A diseased human's poison injures him.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
Mursa's punch EVISCERATES a large guard!
Mursa's punch EVISCERATES a large guard!
A large guard dodges your chomp.
Your chomp EVISCERATES a large guard!
A large guard parries your chomp.
A large guard's slash MUTILATES Mursa!
Mursa is blinded by the dirt in his eyes!
A large guard's kicked dirt scratches Mursa.
A large guard has a few scratches.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
Mursa's caltraps devastates a large guard!
A large guard has a few scratches.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard has a few scratches.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
Mursa's punch EVISCERATES a large guard!
A large guard has a few scratches.

<347hp 211m 203mv 1666tnl (84.13%)> pinch

Tormin sits down and rests.
A large guard has a few scratches.

<347hp 211m 203mv 1666tnl (84.13%)>
Your chomp DISMEMBERS a large guard!
Your chomp MASSACRES a large guard!
A large guard's slash maims Mursa!
A large guard sends Mursa sprawling with a powerful bash.
A large guard's bash hits Mursa.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)>
A large guard deftly ducks under your chomp.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)> You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)>
Mursa fails to perform a joint lock on a large guard.
Mursa's kansetsuwaza misses a large guard.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)> gr

A large guard parries your chomp.
Mursa's punch DISMEMBERS a large guard!
A large guard sends Mursa sprawling with a powerful bash.
A large guard's bash scratches Mursa.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)>
Tormin goes to sleep.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
Your chomp DISMEMBERS a large guard!
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)> pinch

A large guard dodges your chomp.
A large guard dodges your chomp.
Your chomp DISMEMBERS a large guard!
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)>
Mursa fails to perform a joint lock on a large guard.
Mursa's kansetsuwaza misses a large guard.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)> a massive bombardier beetle's group:
<31 Shf> A massive bombardier beetle 100% hp 35% mana 55% mv 185834 xp
<31 Asn> Mursa 79% hp 94% mana 100% mv 235742 xp
<29 Bar> Tormin 100% hp 33% mana 100% mv 196102 xp
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)> You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard has some small but disgusting cuts.

<347hp 211m 203mv 1666tnl (84.13%)>
Your chomp DISMEMBERS a large guard!
Your chomp DISMEMBERS a large guard!
A large guard dodges your chomp.
A large guard's slash MUTILATES Mursa!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> pi
A large guard dodges your chomp.
Your chomp DISMEMBERS a large guard!
A large guard's slash maims Mursa!
Mursa uses his speed and the open space to keep away from a large guard's bash.
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
Mursa painfully hyperextends a large guard's shoulder!
A large guard screams in pain as Mursa applies kansetsuwaza to his shoulder!
Mursa's kansetsuwaza MASSACRES a large guard!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> pinch

A large guard parries your chomp.
Your chomp DISMEMBERS a large guard!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)>
A large guard parries your chomp.
Your chomp EVISCERATES a large guard!
Mursa's punch DISMEMBERS a large guard!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> whe

Mursa grabs hold of a large guard's wrist and twists it violently!
Mursa's kotegaeshi DISMEMBERS a large guard!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
A large guard dodges your chomp.
Mursa's punch EVISCERATES a large guard!
Mursa's punch DISMEMBERS a large guard!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> pinch

Your chomp EVISCERATES a large guard!
A large guard dodges your chomp.
Mursa's punch DISMEMBERS a large guard!
A large guard sends Mursa sprawling with a powerful bash.
A large guard's bash grazes Mursa.
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> People near you:
(PK) a massive bombardier beetle The Muddy Battlefront
(PK) Mursa The Muddy Battlefront
(PK) Tormin The Muddy Battlefront
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)>
A large guard dodges your chomp.
A large guard's slash devastates Mursa!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> gr
pinch
A large guard dodges your chomp.
A large guard dodges your chomp.
Mursa's punch maims a large guard!
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
Mursa fails to execute a joint lock on a large guard.
Mursa's kotegaeshi misses a large guard.
A large guard is covered with bleeding wounds.

<347hp 211m 203mv 1666tnl (84.13%)> pinch
A diseased human shivers and suffers.
A diseased human's poison injures him.
Mursa wipes the dirt from his eyes.
A large guard is covered with bleeding wounds.

<347hp 196m 219mv 1666tnl (84.13%)> pinch
A large guard dodges your chomp.
Your chomp DISMEMBERS a large guard!
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)> pinch

Tormin wakes and stands up.
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)>
Tormin sings 'Ah! the voice of by gone days
Will come back again,
Whispering to the weary hearted
Many a soothing strain.'

The solemn melody gently numbs your pain.
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)> a massive bombardier beetle's group:
<31 Shf> A massive bombardier beetle 100% hp 32% mana 59% mv 185834 xp
<31 Asn> Mursa 67% hp 96% mana 100% mv 235742 xp
<29 Bar> Tormin 100% hp 42% mana 100% mv 196102 xp
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)> You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
Your chomp DISMEMBERS a large guard!
Mursa is blinded by the dirt in his eyes!
A large guard's kicked dirt scratches Mursa.
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)>
Mursa concentrates for a moment and bandages his wounds.
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)>
A large guard dodges your chomp.
Your chomp EVISCERATES a large guard!
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)>
Mursa fails to execute a joint lock on a large guard.
Mursa's kotegaeshi misses a large guard.
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)> pinch

Tormin sings 'Ah! the voice of by gone days
Will come back again,
Whispering to the weary hearted
Many a soothing strain.'

The solemn melody gently numbs your pain.
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)>
Your chomp MASSACRES a large guard!
A large guard dodges your chomp.
Your chomp DISMEMBERS a large guard!
Mursa's punch EVISCERATES a large guard!
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)>
Your chomp DISMEMBERS a large guard!
Your chomp EVISCERATES a large guard!
Mursa's punch EVISCERATES a large guard!
A large guard's slash decimates Mursa!
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)> You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard is gushing blood.

<347hp 196m 219mv 1666tnl (84.13%)>
Mursa grabs hold of a large guard's wrist and twists it violently!
Mursa's kotegaeshi DISMEMBERS a large guard!
A large guard is writhing in agony.

<347hp 196m 219mv 1666tnl (84.13%)>
Tormin sings 'Ah! the voice of by gone days
Will come back again,
Whispering to the weary hearted
Many a soothing strain.'

The solemn melody gently numbs your pain.
A large guard is writhing in agony.

<347hp 196m 219mv 1666tnl (84.13%)>
Your chomp MASSACRES a large guard!
Mursa's punch misses a large guard.
A large guard is writhing in agony.

<347hp 196m 219mv 1666tnl (84.13%)> pinch

A large guard dodges your chomp.
Your chomp DISMEMBERS a large guard!
Mursa's punch EVISCERATES a large guard!
Mursa's punch maims a large guard!
A large guard is writhing in agony.

<347hp 196m 219mv 1666tnl (84.13%)>
Mursa grabs hold of a large guard's wrist and twists it violently!
Mursa's kotegaeshi DISMEMBERS a large guard!
A large guard is writhing in agony.

<347hp 196m 219mv 1666tnl (84.13%)>
Tormin sings 'Ah! the voice of by gone days
Will come back again,
Whispering to the weary hearted
Many a soothing strain.'

The solemn melody gently numbs your pain.
Your chomp DISMEMBERS a large guard!
A large guard dodges your chomp.
Mursa's punch EVISCERATES a large guard!
A large guard is convulsing on the ground.

<347hp 196m 219mv 1666tnl (84.13%)> You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard is convulsing on the ground.

<347hp 196m 219mv 1666tnl (84.13%)>
Your chomp misses a large guard.
A large guard dodges your chomp.
Mursa's punch maims a large guard!
Mursa's punch DISMEMBERS a large guard!
Charging forward, a large guard loses his balance and falls when Mursa avoids him.
A large guard's bash misses Mursa.
A large guard is convulsing on the ground.

<347hp 196m 219mv 1666tnl (84.13%)>
Mursa grabs hold of a large guard's wrist and twists it violently!
Mursa's kotegaeshi DISMEMBERS a large guard!
A large guard is convulsing on the ground.

<347hp 196m 219mv 1666tnl (84.13%)> a
Your chomp DISMEMBERS a large guard!
Mursa's punch misses a large guard.
A large guard is convulsing on the ground.

<347hp 196m 219mv 1666tnl (84.13%)> forms

A large guard dodges your chomp.
A large guard dodges your chomp.
A large guard's slash devastates Mursa!
A large guard is convulsing on the ground.

<347hp 196m 219mv 1666tnl (84.13%)> aff

It starts to rain.
A diseased human shivers and suffers.
A diseased human's poison injures him.
You no longer resist blows.
Your memories of the Chant of Resilience begin to fade.
Mursa wipes the dirt from his eyes.
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)> You can shapeshift into the following:
Form Family Attack Type Skill
Level 14: Anteater xenarthra suction Confident
Level 20: Scorpion arthropod sting Confident
Level 24: Mustang equine beating Confident
Level 29: Bombardier beetle arthropod chomp Confident
Level 31: Stink badger rodent claw Skilled
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)> You are affected by:
Song: 'canticle of the gods' modifies save vs spell by -10 for 21 hours.
Song: 'canticle of the gods' modifies hit roll by 4 for 21 hours.
Spell: 'giant strength' modifies strength by 4 for 13 hours.
Song: 'charismatic prelude' modifies charisma by 1 for 7 hours.
Song: 'battaglia' modifies damage roll by 6 for 5 hours.
Song: 'battaglia' modifies hit roll by 6 for 5 hours.
Spell: 'haste' modifies dexterity by 3 for 3 hours.
Physical effect: 'form bonus' modifies constitution by 1 for -1 hours.
Physical effect: 'form bonus' modifies strength by 1 for -1 hours.
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)>
Tormin goes to sleep.
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)>
Mursa grabs hold of a large guard's wrist and twists it violently!
With a sickening crunch, Mursa applies kotegaeshi to a large guard's wrist!
Mursa's kotegaeshi DISMEMBERS a large guard!
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)>
Tormin wakes and stands up.
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)>
Your chomp DISMEMBERS a large guard!
Your chomp DISMEMBERS a large guard!
A large guard's slash MUTILATES Mursa!
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)> pinch
You try and pinch a large guard between your mandibles.
Your pinching mandibles misses a large guard.
A large guard is convulsing on the ground.

<347hp 181m 235mv 1666tnl (84.13%)>
Your chomp DISMEMBERS a large guard!
A large guard is DEAD!!
You receive 708 experience points.
A large guard's heart is torn from his chest.


I didnt hit any pinches out of all the attempts. And thats all I really have beyond some acid spray which does who knows? nothing every 3 ticks?

There are two things that play into how successful you are with a pinch, and one of them is how confident you are in your form. That is the biggest factor, so my guess is that you recently got this form.

ntnt

I added some debugging and verified it once again...if you were at 100% in the form you've got about a 75% chance to hit a pinch.

...in the log

Level 29: Bombardier beetle arthropod chomp Confident

He's confident in the form. Isn't that enough to make it more than 0% chance :)