One of the most important things for sniping at least is to turn of mouse acceleration. (or put it at 2.2, if its any higher any time you move to look around, it accelerates your mouse and causes you to miss your shot/shots.) 2.2 is a safe zone, for razer settings its out of 10. I have my DPI at 1200 because in this game you need to be able to turn around really fast and people will get behind you. Its much harder to aim but you will get the hang of it.
My in game settings are
0: mouse acceleration
1200: DPI
5: in game
(If you have 7 in game and 800 dpi this is really similar. I just like having a higher DPI for when i play someone like Fragger or Proxy) Making it easier for me to switch in game rather then changing my DPI out of game.
