Can I add my 2 cents, I hope you don`t mind. When driving new F1 car from RSS, I found out that the surface is not that smooth anymore. I remember you were telling me you added bumps (and hope rebound too) manually, and this is what has happened: the road surface is now like a small saw, it has lots of teeth, you can constantly feel ups and down, I mean not normal bumps, which is not normal either. I would try to smooth it a bit.