To (belatedly) answer the question, for me doing those heroics was much easier with my pally as holy and all four DKs as blood. With all the self healing it was fairly easy to keep the crew up with my pally even during high damage fights. Their DPS wasn't as good as my "regular" mixed ranged teams, but with PvP gear they were doing from 7-11K DPS times four, so mobs fell over plenty fast.