Things that really boosted damage for us:
* 4 shamans so all groups get heroism/bloodlust
* A holy paladin giving us the retribution buffs. Check the
spec.
* A survival hunter if you are melee heavy
* Drums of battle for everyone
* Warrior with imp. battleshout and Solarian's sapphire
Seems this "Vengeful trick" is very common for all top guilds. As far as I could see (please correct me if i'm wrong), EJ actually has the best clean report listed, at
28.958k. Doesn't mean that some of the top reports (that one is just #31 wouldn't be higher if the ghost was properly tagged, but I find it unlikely. I'd say that probably the 30k barrier wasn't yet beaten in regular circumstances (no world buffs) at all, which actually makes my own guild
25k record look much better.
This said, like it was pointed, given certain threshold of dps, It really becomes a cooldown based fight, which can't really be used as sustained dps benchmark. Hopefully Sunwell brings a new and better fight for this.