Adjust your in game sensitivty also. So go on desktop and get a dpi setting from your mouse that your happy with (swing the mice around the desktop icons etc) .. then when your happy try playing a game, adjust the ingame sensitivity if its not sensitive enough or too sensitive.
You got 3 different sensitivity settings;
Windows mouse sensitivity
Ingame Sensitivity
and DPI.
Try just lowering them all ooooooooor you can just try to get used to the higher DPI. If it makes you feel any better, I can not have anything higher or lower than 1700 DPI