I have an 04 Cougar that came with the Stolz roller.
I’m convinced that the residue from the roller is because it doesn’t turn as tbe bow rides up. If the roller was a couple of hairs thinner it would turn as the bow rode up reducing if not eliminating residue.
But I have never gotten any scratchs, just residue.
I found the easiest way to rub the residue off is with Acetone dapped on a clean rag.