Few settings I got long time ago, cures some things from ISI FFB
In the controller.ini file make these changes to the FFB:
DO NOT COPY AND PASTE, USE TO EDIT YOUR VALUES
FFB steer force average weight="0.22000"
FFB steer force exponent="0.70000"
FFB steer force input max="11500.00000"
FFB steer force output max="2.00000"
FFB steer force grip weight="0.30000"
FFB steer update thresh="0.01500"
FFB steer friction coefficient="0.14500"
FFB steer friction saturation="0.50000"
FFB steer damper coefficient="0.14500"
FFB steer damper saturation="0.50000"
Sorry that I haven't been able to actually test this mod yet, my job has kept me away from these hobbies quite well, just few peaceful seconds now here and soon 430km trip back home, maybe can start C6 at weekend, I hope at least :P
I recommend that you send PM if need message with me, quite busy at the moment