Assuming you have good DPS mates using AoE skills - not single target - your best skill is overpower, until your storm's eye buff is about to fall off or you run out of TP.
Use inner release to spam your gauge skills - for AoE steel cyclone if you have to get hate/need heal or decimate to maximize damage.

Please don't just spam flash and roit blade to replenish mana. Use your damage dealing AoE skill too, eclipse. Your job is not just to hold hate, but also to deal damage.