When you decide to make new creatures could you please do the following during your design phase.
Equip your character with a void gauntlet or something melee without grit.
Find 2 alligators and engage in combat. (However since every mob uses the same stun/stagger/knockdown mechanic you can probably just do this with any current mob) alligator for the best results.
Finally decide if using the same stun/stagger/knockdown mechanic that every current creature has is a smart path to take when designing new content.