I agree with the precedent comments, and I add one advice:
I've been running quite a lot AK recently, and the only issue in that dungeon for whms is aggro during bosses.
For every single health point you heal, you get 1 aggro "point". The tank gets aggro only by attacking a mob, the new adds are not hating him, but the whm gets aggro from all the mobs by healing anyone, so a new add will aggro whm if he heals, but won't aggro the tank if the tank doesn't hurt him.
When the bees spawn, don't spam Medica-Medica II, just go on healing with Cure, using Cure II as few times as possible, just when you can Freecure.
Don't overheal (don't heal when HP is full) and don't use Regen. Regen is the most useless whm skill, I've never used it, not even with Garuda HM.
When an adds spawns, try not to heal until the tank gets to hit him a few times, unless he is under 50% HP.