Zerg Method
Setup:
2 Tanks, 1 Healer 7 Dps.
Strat:
Pull boss
Noone dps'es.
Stack the Debuff(Amber Strike) to 60-70(while aiming to get the boss to around 71-72%)
Pop ALL your cds, and nuke the boss.
You have an 18-20 seconds window to kill the boss.