That is a bit dark. I think it is because those belt colors are already kind of dark, compared to the basegame yellow, red, blue (green). I increased the tint slightly in version 0.1.11, let me know if that's good.
I did finally manage to load AdvancedBeltsSA by editing it to not require Space Age. (Using the TurboBelt mod as well, which also needed to be edited.)