Logitech G3 to fast!

When i first installed my Logitech G3 after using a Razer Copperhead it was heaven i just found my perfect mouse speed with Setpoint 3.01. Using OS implementation, speed at 4, and a dpi of 1300. Later i got problem with my system a did a complete system recovery, but when i installed the G3 i couldnt get the same sens back (WTF!), but with some tweaking here and there i got it very close. This time with a speed of 3 and a dpi of 1300 (Strange!), then i downloaded the Crysis SP demo the other day installed it and played it, but since it also installed a newer directX i did a system recovery to a point right before a installed the crysis demo. A voila! the speed of the mouse changed yet again! WTF! Now it even faster! And it looks like i have to do another complete system recovery. I have tried everything, looking in the registry, trying diffrent driver versions (3.01, 3.3, 4.0) I even tried buying a new G3 becouse it migt have been broken but its just the same. I mean just becouse you reinsall your mousedrivers the sens shouldnt change and im starting to get pretty irritated. Any help is much appreciated.