Boss #2 was the most troublesome for me, not sure if it's lag or not, but my tank keeps getting hit by tornado and get out of range of the healer, took me 3 tries to down him. What I finally did was, park my tank in the stair crack on the opposite side of the rest of the team, still able to get LOS and not worry much about the tornado, the rest was cake.

Boss #1 and #3 was both easy, got them down on 1st try. Guess I must been a bit lagging, on #3 even though I paid very close attention to his Static Cling, still got hit by it every time but quick dispell worked just as well, plenty of time left to run to the grounding field.