Disengage and re-engage are your friends here. Use them wisely. I lost on every boss on Wanderer's Palace HM, the 1st and last one solved by disengaging and re-engaging. The middle boss, because I didn't remember the strategy on that one. Once I figured it out, it was easy. I will say that WP HM is probably the hardest dungeon to date for Squads, with Braflox HM 2nd only for last boss.