That's waaay too low.
i posted a video on the screen shot thread so you could get a picture of higher sensitivity.
yea, i played on 7 and when I went to 10 i got fast enough to smoke people before they can even pull there guns up.
Turn your sensitivity to 10 and play till you can aim faster than people can react.
add me on live and ill talk to you there about this. too lazy to type, GT is the same as my forum name.