I was wondering if anyone uses those SIT roundwound strings that have the last winding reverse (I don't recall what they are called). But they are supposed to have a nice tight wind that won't tear up your fingerboard. Hence, good for fretless. I currently have DR Black Beauties on my fretless and it is starting to make some marks (barely noticeable, but still...) on my purpleheart fingerboard. I'd like some advice from those who've used them. Such as feel, sound, tension, and of course...how are they on the fingerboard (especially a raw wood one).