As others are saying, grab some of these enmity down abilities. Leveling doesn't take that long and it's all to benefit your main class.

I dunno how encounters in other games are but a lot of the current end-game encounters are designed so that it becomes REALLY painful if your damage slows down due to phase changes or increasing add difficulty as hp drops. If you have to wait for a long time for your hate to drop unable to do anything your healers and other party members will eventually be unable to keep up with the amount of enemies or damage being dealt to them. You have to remain consistent in your damage to keep the pressure on the boss so you can finish them off and being able to quickly reduce your enmity lets you do that.