Ran a DF AK when I was bored and the healer was pretty new and died on the last boss at 50%.

With the use of Stoneskin and cool downs you're pretty much self sufficient. (Might help that I'm fairly overgeared) but you keep that Stoneskin up and spam cure with convalescence during Catastrophe and you're golden.

Also on Turn 2 if you're not on silencing duty while tank switching it's always good to cast Stoneskin on the other tank when they've got hate. This will really help the healers and if timed right you can negate a stack debuff