Had the same problem, found one solution.
I had the same problem with the mouse sensitivity. My mouse is Logitech mx-518. There is the option to "map directly to axis value" in game's control menu.
- Without it my mouse was too slow no matter where the in game sensitivity slider was.
- With it my mouse was too fast no matter where the slider was.
Logitech Setpoint software solved the problem. I just clicked some options here and there in Setpoint gaming performance menu and let it run in backround. I have the "map directly to axis value" option on and I have playable nice sensitivity now.
"I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched c-beams glitter in the dark near the Tannhauser Gate. All those moments will be lost in time like tears in rain.."
- Legendary Roy Batty in the movie Blade Runner