I have the Sidewinder wheel too & initially had a similar problem, but because I have been changing so much stuff I can't remember exactly what I...
I had same problem with my Microsoft wheel so I changed the Steering Effect Strength to -10000 & problem fixed,
This fixed my problem, thanks
I was getting very bad stuttering, & also minimal acceleration, I found turning off the force feedback worked, no more stuttering, & acceleration...
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