I've got a KSD fretless 5 with an ebonol/phenowood/phenolic fingerboard, with inlaid fretlines. Sounds great in general. I notice a slight buzz when fingering a note on top of some fretlines, esp under the G-string (I'm using roundwounds, FYI). This is more noticeable when sliding over the offending fretlines. I'm guessing that some of the inlaid fretlines either lie slightly below, or (more likely) protrude slightly above the surface of the board itself. Seems like it would be pretty straightforward to resolve with sandpaper, etc, but...any advise for how to smooth out these irregularities, or is this something that a luthier is better off tackling? And if so, any idea on how much this should run?