So I play at about 8.2 inches per 360, which is 1000dpi @ sensitivity 2 in-game with raw input (Polling rate is 500hz but I don't think that matters).
I find this to be optimal when playing Soldier or Medic, but when I play Scout it's like I massively overshoot a lot of the time (It's not stress, because it happens in casual too). It could be that I'm not used to playing so close to an enemy, but I don't know for sure. I don't think my aim is necessarily bad in other games or scenarios, but it seems like when I play Scout my aim goes to crap for some reason.
I've considered trying to learn a 2nd sens to use with Scout but I don't think I could get accustomed to switching between two sensitivities.
edit: thx for the tips guys, ill be sure to work on my strafe aiming and midrange shots, among other things