Does the level of trap ingredients I use affect the chance for my foes to escape the trap I set? In other words, if i use higher level of trap ingredients, will my enemies have less chance to avoid it?

I don't think so; I think it just makes the effects stronger. That being said, I don't know for sure offhand.

Edit: Except knock-out. I'm 90% sure that works more often with better ingredients.

As high lvl ingredients takes much more time to gather, I hope Daevryn is right... Anyone can confirm about knock out hitting more often with higer lvl ingredients?

PS: Thank you for taking time to answer Daevryn.