I bought my first fretless and I think I might need to get the nut replaced. The nut itself is in good shape but the slots are cut so deep that the strings rest on the fretboard in front of the nut. In fact, the slots continue into the fretboard on the tuner side of the nut. I've read that the nut slots on a fretless should be really low, but still have the strings above the fretboard. The only real problem I'm experiencing with this is that I get a clanking noise when I fret at the 12th fret. Because the nut slots are cut so that the strings lie on the fretboard when I fret at the 12th fret half of the string is hitting flat along half the length of the fretboard. Do I need a new nut? Is there an advantage to having fretless nut slots cut this way? Thanks!