Thanks for this. It's a really great-looking track and finally gives hope that photogrammetry might actually work if combined well with traditional 3D assets, without everything looking like melted ice cream. It certainly gives more of a naturally organic look to the environment. Even the best manually-textured tracks can look rather fake by comparison.
I noticed that the trees have planar shading so the normals probably aren't pointing vertically.
Add this to correct that, but you might need to adjust the ambient and diffuse values for personal preference (I've not tried it in conjunction with your own config adjustments yet).
I had to point the normals vertically down for some reason, pointing up didn't work. It sometimes doesn't.
Code:
;fix tree normals (should work if ksTree shader is used)
[ALTER_NORMALS_...]
MATERIALS = shader:ksTree
OFFSET = 0, -1, 0; 0, 1e9, 0
DESCRIPTION= lighten/darken trees after normal fix above
MATERIALS = shader:ksTree
PROP_... = ksAmbient, 0.4 ;adjust for personal preference
PROP_... = ksDiffuse, 0.4 ;adjust for personal preference