When someone has obviously NOT read anything, hit the Report button rather than bitching at them for not reading, then helping them out. Doing that both gets you an infraction for backseat moderating and rewards their laziness.
Did you actually read anything in the Cat DPS thread or FeralByNight?
Strength is definitely NOT the way to gem...
Agility gives you only 1 ap instead of 2, yes. But it also gives you crit. You say, that you don't benefit much from crit, because you've got nearly 50%. That's quite nonsense.
The Crit Cap is at 75% for autoattack and ferocious bite (assuming hit and expertise capped). If you are below that, then more crit is always good.
Remember - more crit = more Combo points.
Actually there is another discussion going on right now, concerning ArPen vs Agi. ArPen scales better than linear, meaning: The more you have, the better it is. At some point, ArPen will become the best stat and thus the stat you should gem.
It's still unclear, when this point is reached. Some models say, you need 200 ArPen to become the best stat, some say 350 and some say it's even 750 or more.
Follow the discussions on the two threads Cat DPS rotation and FeralByNight, and you will know soon.