My guild is working on this as the first encounter for this raid tier (not counting BH), and we've been running into troubles just with the raw amount of healing needed for the fight. Our dps has been very good (everyone is between 10-15k), and our tank is now roughly 350 geared so he should be good as well. We've been downing the worms relatively easily in the fight as well, and our strategy for controlling them seems good. However, our heals just cannot keep up this fight: generally what happens is a dps will go down sometime before the first magmaw flop, he'll get a bres, then another one will go down shortly after the flop, and slowly the raid will go down.
2 of the healers are entirely heroic geared, the other is slightly less so (~333 level), and this other healer is also less experienced. I'm just wondering if anyone can give some pointers to our healers for this fight, maybe share how you dole out your raid's healing, etc. We've got two druids and a shammy for healers by the way.
Edit: One other thing, would it make sense for us to try Omnotron first instead of magmaw? Is that fight less punishing to lesser-geared guilds?