Obviously, keep farming your 5's for points. If you really want to get good at arena, I'd recommend playing one of your ele's solo in a 3's or 2's team.

This will let you see what different classes do to your shaman and who's a good first target, and who can get away easily. Who will LOS you etc... You'll find that it's almost impossible to kill a decent healer with interrupts etc.. It's like playing in slow motion.