Post for help that lacks several of the points mentioned in the OP, perhaps only a warning, though.
* WWS/WoL/WMO or similar report if possible
* Information on total number of healers being used
* If relevant, the healer composition
* Your experience with the fight you are asking about . Please don't just attempt a boss once then come asking for help/advice. Give it an honest night of attempts then bring your issues here.
Im having a big problem with festergut. Im holy and obviously on raid heals but with GCD's i seem to be having a lot of trouble keeping people alive through the first three phases. Im using mostly PoM CoH Flash Heal to get 3 stacks of serendipity then PoH. I dont usually cast renew. Will it make that much of a difference if i do cast renew on everyone in the beginning and then dont worry about it after the first inhale or is it to mana inefficient? I was also only at 5K on the dot GS now im over 5200 will that make that much of a difference?