I do not know how others are doing it but since day one of our progress i've been interupting all blue adds alone as a paladin.
After the 1st arrows in p2 it does not matter what you do with the 1st blue elemental.
We just move close and kill it with cleave.
Then i move as a paladin to the other and continue interupting.
I should mention that i taunt each tank debuff that explodes 1sec before its applied so i explode all alone in the room.
Paladin is amazing for dealing with this allowing all your ranged to focus on the boss entirely.
Spellward + bubble + kings + AD and you will never die to rings even if you are getting them your way.