I've got a 5 string spector that I've been working on setting up. I can get the action fairly low however when I try to go lower; I can't seem to get rid of buzz on the 23rd frets, all across the board unless I play with an extremely light touch which is fine but if I try to go lower it gets worse and will buzz no matter how light I play. It only buzzes on the 23rd fret. Any ideas? I have a new fretless neck on the way from spector but until then I'm fretted.m Thanks!