The mana issue wont be solved by keep on trying i think, i think we need to make 2 Groups virtually, let me explain.
the tanks work as 1 group, tanking the adds at the foot of the stairs (like or last attempt 18/04/06) but the DPS (Mages, Locks, Hunters and Rogues) could be split up in 2 independent group working with 2 MA's, 1 for DPS group 1, 1 for DPS group 2.
That would bring each mob down extremely fast, and would rely on a fast focussed MA, and most important Mana conserved, the reason for 2 DPS groups is to avoid some of the wasted Casttime and Mana, by having only 1 target that is going down very fast.
The healer group and Tank group should just work like last time, i think that worked out well, so i see no need to change.
Luthor
Yes, and we dont even need 2 ma's, everyone just make a macro called /assist (whatever tart is doing it) and use it, ooor just target the MA and push" f" .
The 2 groups per "door" where they spawn, would be the solution imo, we cant Ae all the adds. and as seen in a vid that was posted here somewhere, there is a mage using rank 1 Blizzard (who has imp. Blizzard) that keeps slowing the mobs:)