Get the tank to run from corner to corner in order to force the adds to gather an a possition for good aoe dmg (even if it's just 2 or 3 of them)
Interupt casters.
Umm why?
That's not even the hardest fight in there...
Seriously have your tank range taunt them all go hide their face in a corner till they stack on them and then burn.
A nerf is simply not needed...