You do have MarkC's mouse fix applied as well?Windows enhanced pointer precision and stock mouse curve are horrendous for serious gaming.
Yeah re-did the MarC fix but forgot about the windows one. I am so annoyed, at least x1 every TS session I say the words "my aim is way off again" - that is probably why, my accuracy was ok then for a reason I couldn't fathom just went kaput. Now I know what may have caused it.