I think the issue I'm running into is when one healer gets the debuff, and the DPS would continue the normal path instead of compensating for the debuff and possibly changing their rotation. Then, so the healer wouldn't blow them up, would rotate to the 6'o'clock position and be out of the range of the tanks. Then then tanks would take a couple of huge hits and die as the other healer couldn't keep them up since they die in between heal casts.