Apparently you're playing the game -- you should fix your profile so that people can see where you play and who your character is.
I re-gemmed for ArP and I noticed my DPS in heroics went down because I often find myself just spamming swipe. My ArP is currently at 322 (26.14%), 1316 Agility and 49.44% crit un-buffed. It does seem to be higher on boss fights where I have time to work my full optimal single-target rotation and pop Berserk + Incisor Fragment (still need Mjolnir Runestone), keep Berserking and DMC:Greatness buffs up though. I don't seem to have gained any dps over other cats that have gemmed for agility but maybe this is because I am still well below the ArP cap and this will change as I get closer.