This is the Senormen - Digga version of Road America. This is a small update to Road America, the brightness of some of the advertising banners has been reduced. I have full permission of Sernormen and Digga to post this update.
I just ran some laps, I didn't feel any nasty bumps. Are you sure you were running this version, I recall I tried another mod of this track and it did have some nasty bumps on that corner. If you have another mod of this track I suggest you uninstall it. Also empty your CBash folder and Shaders folder. Hope this of help. P.S. I am not a track modder I only changed some of the graphics so I would have no idea how to do it anyway.