Icecrown Raiding Update, Take Two

We have become stuck on the Deathspeaker High Priest. For those of you that don’t know, this is the most overpowered mob in the game. When we initially encountered it (running with our 4 healers that we needed to defeat Lord Marrowgar), we noticed that the raid was taking too much damage and dying very quickly. So we made the switch to 5 healers and although the raid isn’t dying as quickly anymore, we are still struggling a lot. These mobs heal up about 25-30% of their HP every 10-15 seconds or so, and we can’t dps them down fast enough before our healers go OOM and our tank goes splat. Our 4 DPS (we run 1 tank for Marrowgar and probably will for Deathwhisper once we get there) just aren’t getting it down quickly enough.

We don’t have an MS effect, our only warrior is prot, our only hunter is BM, and we have no rogues, which some of you who actively peruse these forums may have already noted in an earlier thread. Is this what is hurting us, the lack of MS effect? I hope it isn’t, we already had to pay a rogue from another guild to come in and help us clear Marrowgar trash, and I don’t want to have to do the same thing again. Or is there another issue at hand that I am missing?