two things:
a) the adds HAVE TO HAVE TO HAVE TO die during the green phase. Not almost dead. not near dead. Not "ooohh only 1 left with 100K HP". Dead. If not, during the next red and blue phases they get the 99% damage reduction and will not die and add on top of the other adds you have to release during that cycle. 100% of DPS should be on adds during green. Only person that should have Maloriak targeted is the MT. Also it is extremely important to try and tank Maloriak away from the adds during green, even though he jumps right in the middle of them and is a bitch to move.
b) he casts release aberration once during the green phase. You will either need to catch it or count it as your next add rotation. We usually catch it otherwise it confuses some people that adds are "still up" when the phase ends and they sit there trying to burn them after the phase switches not realizing they are doing no damage to the adds.
the only "hard" boss for us this tier has been chimaeron. We downed him this week (and maloriak the same night right after.. like two shots) and he was still a pain. Our healers finally got on the game of healing during the bot phase (we always did fine during feud, unless people were dead before feud started thus increasing our damage during it). Our new obstacle for about 2-3 pulls this week was WHEN the last phase starts. it took us 2-3 pulls to realize we REALLY have to watch our DPS around 20M. If we are at 22-24M and there is a massacre coming up, we need to lay off DPS until after the massacre, because if we keep DPS up, the bot goes offline, and then he goes to the final phase with us clumped up...... yeah.. so basically the coordinator calls out to lay off DPS shortly before massacre, if bot goes offline there is ZERO DPS during feud, and if bot doesn't go offline get in position for final phase and go into burn phase immediately.
as a mage we found what works best for us is to hit invis right away, then drop MI immediately. it pretty much guarantees we are the very last on his threat table for the rest of the fight. actually in that regard this fight is VERY mage friendly. There were like 6-8 people left alive when he died, and three of us were mages.