Is that the Forza CSR wheel you've upgraded? If so, which firmware did you use as there are 3 on their website - I've done no installs since getting my wheel a year ago .
Last night was my first ever GT experience as I've always been an xbox-man. That constant vibration was really bugging me! Glad there's a fix for it.
Now I just need to find wheel parameters that feel nice. Braking seemed to make very little difference last night - but that was probably just my lack of skill ;-)