I've been googling around and I'm not the only one who has complained. There seems to be a problem with the deadzone that was never fixed. I have played it on Xbox One with the same wheel and it's fine. Messing with the settings doesn't fix the issue. I just tried Forza Horizon 3 and by default it had the same issue but I was able to fix it by changing the deadzone. It's where you are trying to balance the car by going one way then the other and so you're all over the place and the experience is not good.