Any suggestions?
This on really depends on the raid and the situation. If you have a situation were there are no mezzed mobs and there is no Z axis aggro issues, then you need to use your AoE ice nuke and you AoE disc (Tempest of Claws).
This thread will give you a good starting point:
https://beastlords.org/index.php?topic=30796.0
-Z-