Call of Duty Sensitivity help!?

Ok so I play all Call Of Dutys on sensitivity 3, but i took a break from call of duty for a couple days and i played infamous, and the sensitivity on infamous is like 1, once i beat infamous i went back to playing Call Of Duty, but i wasnt used to my sensitivity on call of duty (3) and it was really hard to kill people, so i played some combat training for awhile to get used to it most of the basic controls i got used to (moving your character, aiming at people who arent moving, etc.) the only problem i have is aiming down people who are moving cus whenever i try to take down a person who is moving, i always overpower the aim, is there anything i can do to fix this situation so my aiming can go back to normal??