Running one healer. The problem with body pull and pre buff is that the tank isn't generating any agro when they're gathering mobs, so any residual healing on the tank will cause the mobs to rush the healer. I know it's hard to come up with a solution that works for all group, but I think just having the whole group rush in would be better. Plus it would also cut down on the yoyoing when the tank tries to pull mobs back to camp location. Yoyoing is also another cause of wipes it seems, tank would pull, bring back the mobs no problem, but the tank would just yoyo back and forth not targetting the mobs for group to attack.