I always believe that looking only at the DPS digit is a bit superficial; depending on fight circumstances, tactics used and amount of movement, DPS may drop significantly, regardless of item level.
I only have the log info, but here are a few things I could mention after taking a quick (but maybe not so accurate) look:
- So far, it doesn't seem like you wiped from DPS, but from execution of the fight. Look at DPS if you can't push P2 fast enough (should be at most very shortly after the 4th adherent has spawned), or if you get overwhelmed with tentacles in P2.
- You are using 3 healers. It's probably easier to go with 2 instead. Have you tried it?
- Interrupts for MCs aren't going very well. Find a better plan for this: I would suggest looking into priests rotating glyphed fear, and melee using a /targetenemyplayer macro for easier targetting.
- The little adds are very problematic. I would suggest your DK using a Chillblains spec, and just throwing everything he's got at them. For the first two packs at least, I think it's enough if only him and the hunter stay on adds. A D&D and a lot of howling blasts will do the trick, especially with hunter help.
- Assuming the point above, with the adds, work, you may want to keep the Adherent adds slightly closer to the boss, so people don't have to run too much in order to DPS. The purple "circle" in the room is a good indicator, tank Chogall at one point and tank the Adherent at the opposite point (so a lot closer than some guides may suggest). If needed, the add tank can move the add a bit to the back when it's on very low health. The important part here is that people shouldn't have to move
extra in order to get in range of the add. Minimising movement needed = increasing DPS.
- The raid is taking a lot of extra damage from Corrupting Crash. Focus on spreading out as soon as the Adherents spawn, and do your best to avoid them. This extra damage + the very often 2 MC stacks probably adds up, and if you get rid of the majority of this damage, you can get away with 1 less healer.
- I see you have two melee. If you can kill the Adherent in time, it may be an idea to keep one of them on the boss so he doesn't lose too much DPS from movement. Probably the DK is a better choice here, seeing as warriors have 100000 "teleports" Have your tank assisting with interrupts on the add as much as possible.