Defiance should mitigate 10% more dmg and Deliverance should add 10% more DPS. Just that would make a 50 beast cost feel more appropriate.
Infuriate would be a good way to deal with the stance swap penalty. I'd leave the timer at 60s, but either have Defiance/Deliverance trigger a 15s timer reduction, or have Infuriate fill the beast gauge completely. Leave to "in combat only" but extend its power in order to tweak the stance swap.
I think fights where stacking debuffs happen give Shake It Off its purpose. Not sure how many of those kind of fights are in the 68+ content because I am not there, but that would seem to be it's best intended use. Stuff Esuna cannot get rid of, but SIO could? It needs a shield, dmg reduction or heal added. Nothing major, but something like 1/3 of Equilibrium in Defiance?
