the Gestalt Metamorphosis edge carries over svirf racial resistances to fire, cold, acid, lightning, poison, and disease to my alternate forms. When I take caiman form, which has -33% resist cold (vuln cold), the carry over of svirf resist combines with caiman's vuln cold to slightly mitigate it, resulting in -13% resist cold, instead of -33%. In the case of fire, though, caiman starts out with 33% resist fire. With gestalt metamorphosis, svirf resist fire should combine with caiman resist fire, resuling in higher resistance to fire than 33%. However, I still have only 33% resist fire in caiman form as if I didn't have the edge. The same thing is true with Walrus form which has inherent resist cold. Instead of bumping up, it remains at 33% resist cold.

CAIMAN WITHOUT Gestalt Metamorphosis:
sc damage
Bash : Normal Pierce : Normal
Slash : Resistant 33% Fire : Resistant 33%
Cold : Slightly vulnerable -33% Lightning : Moderately resistant
Acid : Moderately resistant Poison : Resistant
Negative : Normal Holy : Normal
Energy : Normal Mental : Normal
Disease : Resistant Drowning : Immune 100%
Light : Normal

SVIRF
sc damage
Bash : Vulnerable -33% Pierce : Normal
Slash : Normal Fire : Moderately resistant 20%
Cold : Moderately resistant 20% Lightning : Moderately resistant 20%
Acid : Moderately resistant 20% Poison : Resistant 33%
Negative : Normal Holy : Normal
Energy : Moderately resistant 20% Mental : Normal
Disease : Resistant 33% Drowning : Normal
Light : Normal


CAIMAN WITH Gestal Metamorphosis:
sc damage
Bash : Normal Pierce : Normal
Slash : Resistant 33% Fire : Resistant 33%
Cold : Slightly vulnerable -13% Lightning : Moderately resistant 20%
Acid : Moderately resistant 20% Poison : Resistant 33%
Negative : Normal Holy : Normal
Energy : Normal Mental : Normal
Disease : Resistant 33% Drowning : Immune 100%
Light : Normal

Both of the score damages you presented are with the edge, even if they do not both have the % reduction in them.

I am also quite happy to say that it is by design that it doesn't stack with a form that already has a resistance to one of the dmg types.