I know I'm beating a dead stick with a horse but hear me out.
I think the resolve system is utterly broken. Many times I get stunned while I'm full resolve. I've been knocked back, full resolve, then stunned, I don't know if it's the way the abilities were thrown saying they were pressed at the same time by two different people and then hit back to back. But, here is what I propose. I know you don't want to be 100% like WoW, but their system worked. Diminishing Returns. After a certain amount of CC/stuns, stuns/CC no longer worked, and every CC/Stun before the full DR hit, was reduced in time, making stuns/CC a lot less frustrating in my opinion.
Also to clarify the roots affecting resolve, roots don't affect resolve because you still technically have control over your character, resolve affects the abilities where you lose total control of your character.