Try this with the first boss. Place your guys at the start up top where they can dps halfway down ramp. Bubble hot w.e your tank. Have your tank run down and initiate taunt. Then run back up the ramp. When ur withing dps range stay there.

This will allow all the adds to stop at your pally making it easier on you. I do it that way everytime just so i dont have to worry about the poison shit and all.