In some recent reading on elitest jerks forums it seem that with bubble/divine sac we can eat most of the tantrum damage. but only one time since I would probably be the only ret pally and bubble is still a 5 min cd. it will nerf my dps, but for the greater good, oh well.
http://elitistjerks.com/f76/t53532-3...in_thread/p15/
Other ideas are we could have some healers dps in the very start of the heart phase since no one is taking any damage at that point since the add havent yet spawned and the MT isnt getting hit. this is also mana willing, but that extra little bit is what we are looking for.