Thing is, would it be better to have our Tank OffSpec as Frost to keep it together better or the DPS? I was thinking the DPS DK, but I'm not sure. The Tank DK would have more health, but I don't think he has the slows available that a Frost DK has. I could be totally wrong though.
If you're having trouble AoEing them, have you tried just having the DK tank the adds and put the druid tanking magmaw? That way you could just have your DPS ignore them altogether. It'll be a bit harder on your healers but if it's DPS that's the problem it's worth a shot.
Cur ante tubam tremor occupat artus?
Raid Leader of ATQH|SoE|Horde|Belsagore-- 85 Shadow Priest