I've had some success in phase 3, with sub g12 half the squad & doing close to 5m damage.
D.Revan, Bastila, HK, Maurauder, Palp (last one should be assassin but don't have him farmed yet) - sith trooper is trash.
The aim is, to drop one saber (unload full turns with deathmark) - next saber - repeat, then topple her with deathmark on.
Load up as many debuffs as possible, then use HK-AOE attack to proc death-mark many many times. Using this I reckon a full G12 god-modded squad could push well over 7.5m+ on sith raid phase 3.