[Jason Chamberlain]

I have definitely experienced this. I would practice and be doing fine then when I'd do the race I'd have to turn the wheel about twice as much as I would have expected. Sadly, the most reliable fix seems to be to join the session from inside the regular AC menu instead of from Content Manager. That fixed it for someone else and that helped me as well.
There are some CM settings that you might be able to tinker with under Settings...Controls. I haven't had the time or patience to try that yet. 
Good luck!
Jason