Took a few attempts but I just got the pacing down enough to move my team, via follow prior to the spike. One thing I did with my mixed class team, was recover while the boss is up. Heals, mana gems or invoc, fiend... the boss up phases are cake compared to boss down phases so I try to stretch out the boss up phase. I found that the other instance, kingdom, in AN was a lot easier until that last fight where my mages were toast. I had to finish the last boss off with the tank, priest, and shaman.