In testing the beta, one thing I noticed was that some mice acted differently from others. Didn't matter if I was using the proprietary software for the mouse or not (i.e. logitech's, razer's or microsoft's drivers). The Logitech G9 in particular, when I first loaded up the software, I used 1600 dpi and a 25 sensitivity and in game 10, and everything else was default. 500hz for the mouse and middle mouse speed and all that fun stuff. Still, it was WAYYYY to fast for me to handle. While small mouse movements were good, simply moving my aim from spot to spot was very hard to control.
It should be noted that I haven't heard of anyone else experiencing this issue. BUT if you do, read on:
As with any software, I recommend experimentation to get the feel that you want. For me, for example, I'm using the software with a sensitivity of 39 and a mouse DPI of 550. Just feels a bit smoother to me that way. Maybe it's all in my head, but it's definitely alot easier to control that way. I started experimenting with the lower DPI settings when I heard about DBLdrew (or is it DLBdrew) using an 800 dpi at 40 sensitivity (again way too fast for me at that sensitivity).
As far as skill level goes, once you get to say...level 45 or 46 or so, it doesn't really matter WHAT your config is or how it feels. You're going to have to change your brain configuration to get to a 50. Tactics, lag, hosts, teammates, etc all have an effect. I recently started a new account in Swat and could pretty much carry my team to victory no matter how n00bcake my teammates were until I got to level 45 and then I hit a BRICK WALL and started losing alot. I had 22 games in a row that I won at one point running by myself. I think I'm at level 47 now under my Ub3rnobber account. My config feels great. It just doesn't matter. Some times I'll sit and play for awhile and win 10 games in a row. Other times I'll lose a few in a row (not 10...let's not get carried away..hehe).