Wow Web Stats
Wow Web Stats
Those are the only two WWS reports I have for lurker . You can see that DPS is pretty limited in general for everyone, and in those parses I'm in pretty decent gear (the first was around about our first illidan kill, the second about a month after) and I was tanking all the submerge phases (although in full DPS gear).
As has been pointed out by other posters, you should be following him (running around, not underwater - helps if you have some form of runspeed on boots/metagem but you should be fine otherwise, and you can always dip underwater if you need to) to be able to shred whilst he's spouting or you're losing a significant portion of DPS - this should up your ratio of mangles : shreds which will help your DPS.
Your melee hits is ~360, which is about 6 minutes of "contact" with targets as cat, over an 11 minute fight. As a direct comparison, I had ~200 and ~210 (about 4 minutes "contact") over just under 6 minutes. Some of this can be put down to knockbacks, some to running between mobs and shifting forms (when he submerges). The more contact time you have, the more DPS you will do in total. More contact time can equal a lot of extra DPS.
You could be using your trinkets better too. Valor (crystalforged) was used 6 times and could have been used 10 or 11, and Lust for Battle used only 4 times and could have been 5 or 6 times. I hope you had all the relevant buffs (5 paladins so should be no problem) but you didn't have a shaman, so that'll be a significant chunk of DPS "lost". It's hard to tell anything further about buffs without having been at the fight.
A lot of the variance in DPS will be just because of how the fight works. Every time you do the fight, you'll improve your timing on the abilities and be able to get more DPS out the movement (increasing contact time) without putting yourself in danger of dying. Lurker has always been a funny fight for DPS because of how it works. As Baggles has pointed out, you'd be better off comparing your DPS to other melee/other people on a fight like Morogrim because it's much more of a "pure" DPS test, as long as you aren't tanking.