So I'm working with rocks again.

This time on a supercross, seems to me the best way to go is to use invisible ramps (wide wood ramps mostly) to smooth stuff out as much as possible, especially on curved pieces.

And Deco-only rocks just beneath at least on flat surfaces (Flat slabs).

Supercross is extra sensitive as each lane needs to be 100% the same (straight track from west to east on map).

On Trials mode I'm a lot more forgiving when it comes to rocks.