I had a bunch of issues but now fixed all of them.
First of all, I encountered a grey screen which I then fixed by changing the PP-filter.
The next issue was that the sky texture was somehow broken and it looked like it was midnight.
HOW I FIXED EVERYTHING:
I reinstalled Sol, then installed New Horizon Shades again.
Works now, looks great and I don't know how the **** you did it but I get incredible FPS.