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I initially went down the path of just painting over the map's gravel with the gravelSmall texture in-game within my save, but after I accidentally deleted that save I was reluctant to do it again.

I ended up figuring out how to remove the "stone" foliage from the map using Giants Editor, which takes a lot less time and also enables creating multiple saves without having to repaint each time.

Basically, and I'm in no way a map modder, I believe the map is using the standard gravel textures but adds a foliage layer of stones.  Painting over it in-game works because the painted textures overlay the map's textures.  Removing the stone foliage layer from the map itself is a more robust approach.  Another advantage to removing the stones via GE is that it can be done without affecting any of the nice visual touches provided in the map (mud, tracks, etc.). Obviously, you lose the 3d stones on the gravel but I'd much rather have the extra 20-30 fps and have my GPU at 65% instead of 99%.