After years of fov 110 (and 105 for rail), sensitivity 7 with a logitech MX510, and my windows cursor speed on the 4th notch out of 11 notches with no accel, I've now lowered my fov to 90 (

) and sens to 6. Haven't adjusted windows sens. What a difference. I've tried 90 on and off and never liked it. But I've gotten used to it and it's making my aim so much more accurate. And that one notch down on sens is making a big difference too, far more control.
I asked a couple of great players who constantly win games on servers I'm on what their fov is. They both said 90 fov. So if it's good enough for them, it's good enough for me.
Of course the trade off is less all around view, but it's not bothering me now.
I have a feeling though that perhaps the sens adjustment is making the biggest difference in accuracy for me.