Originally Posted by
Benefits
The amount of HP they have on 10 man as compared to 25 man seems fine for the encounter, especially considering it's heroic. Just make sure the tank that is in charge of the aberations is doing as much damage as possible to them. If you have dot classes, they can throw a few dots on them before the AOE phase. When the green phase does come, make sure the add tank has them in position to be AOE'd on top of the boss well before it's time to do so. Having them all fully debuffed as much as possible before the AOE phase will greatly help as well. If they don't all die during the green phase, make sure a few dps stay on them until they're dead and continue with the encounter, despite the damage reducing buff.
Edit: I just saw you said you're AOEing 9 adds. Why in the world are you letting that many out per phase?