I like some of your proposed changes especially decoupling the healing % buff from wrath. as I believe this would be very beneficial.

Wrath stacks (Defiance Stance) Increases your Crit chance and parry rating for x% per warth stack (something that would balance out not having block), and restores HP for each critical hit you land (maybe only at wrath V). Effect fades over time and ends upon use of wrath consuming abilities.

IB would be encouraged to be used and the effect of loosing parry rate and crit rate would not be as bad as loosing the healing buff. Smart play will still be needed on the use of our burst mitigation tool.