Death Knight tank, 3 Elemental shaman, Resto shaman.

I drive with the DK, and just keep an eye on my shamans health, LHW self for the whole group when needed while i kill the copies on my DK. I also allow "tab" to broadcast so my shamans can try to kill some of the copies while im not really watching them. I didnt have much trouble at all. I think with your setup you might have to switch to the mage, and let the other 4 self heal (or in the pally tanks case he can prob just stand there and take it like a man).

Good luck