Dr G· Distinguished SOTW Member, Forum Contributor 2015-
I use them on HR and metal mouthpieces since they came out, and my mouthpieces are not scratched up. You must be encountering some operator error issues. The worst scratches that I’ve seen have come from people using the wrong size Rovner.Pretty sure the "ultimate" in the FL Ultimate ligature means it's the ultimate mouthpiece scratcher.
Regarding the OP: That scratch is too deep to buff out without removing too much material. The good news is that it doesn’t affect the critical regions that affect how it plays.