If you haven't already, I might recommend that you look into getting a "scuf" controller or at the very least, some "kontrolfreeks" for your existing controller.

They may seem gimmicky, but I've tried both and they definitely reduce some of the console gaming lameness. There is sound science behind the increased precision offered by the longer thumb-sticks, and in the case of the "scuf" controller, you can further customize your setup by ordering one with additional button paddles on the underside. (where your middle and ring fingers normally sit doing nothing)

The paddles are super cool, because they allow you to perform more complex maneuvers- for example, you might jump, turn, aim, and fire your weapon all together.. Versus the standard controllers which require you to remove your right and/or left thumbs from the sticks to press d-pad or X/Triangle/Square/Circle buttons...

Sorry Rands, if it sounds like I'm selling snake oil here... But I am a true believer in these products, and they have absolutely increased my enjoyment of console-FPS

Cheers!