this would be great. And I also think their res should be about 40-45%. So 80-90% when stacked. Other options could be explored too like giving the player res/immunity to being stunned by mines, stun nades, etc..
even with 2 donor rings you get 2 shotted by SSH sgs (they shouldn't exist). Sacrificing so much HP/AP in the current state of the game should give you quite the benefit in return, and 50% ex. DMG RES isn't it