Looking very atmospheric, Epo!
I've been talking to Paulsw2 about the way the stone darkens depending on the settings in TS19, and it's looking as if I'll end up adding at least one more stone version of the buildings over the next couple of weeks: I'm playing with a much lighter version which looks horrible on both my rigs, but about right in the screenies Paul's sending me back, and as we've already seen, his settings and environment seem very similar to yours.
I also have some other stone textures from very large buildings to try out in the hope that I can find something that really works in that rather different situation from the one I had in mind when starting the project.
Cheers,
m