CSS and CF sensitivity

Since i play a lot of CSS lately, when I start plying CF it takes hour to get used back to its sensitivity.

Can somebody tell me how can I adjust sensitivity on both game so its same or similiar.

I still wanna play CF so help me.

My mouse.

Gigabyte GM-M8000
DPI 800-4000 (its set on 800 since i like it)
My CF sensitivity atm : 13
My CSS sensitivity atm : 3,6

Im not gonna change my CSS sensitivity since i feel pretty good with it.
What should be my CF sensitivity ?

With regards, Authentic_.