I'd say you are doing well, the rest of your guild needs to pick up the slack, I'd say I do around 20-25k average on my alts that start with 372 gear in LFR and it goes up from there, and I don't consider myself the best player ever. Hunters can still pull some pretty beastly numbers this tier if they have all the goodies (2 piece, DW weapons, trinkets, etc) but, at the end of the day, in a group of equally skilled players, hunters are not on top. In other words, if you spent 5 minutes on EJ and played one of your guildie's toons, you'd probably pull more dps than they do on them.