http://www.wowarmory.com/character-s...all&cn=Rathenn

This is my armory, and I was going through WoL and I find that I can pull a sustained 8-8.5k dps on fights such as Festergut in 25 man. Upon going through WoL some more, I find that there are mages (Granted they do have some better gear) doing 11k dps in 10 man on this same fight.

I know my rotation fine and I am pretty aware of whats going on in all the fights that I do. Is it my gear that is holding me back from doing more dps? Or am I just doing something wrong?

Thanks in advance