I am setting up #3 that I just completed. The action at the nut is perfect for me, the bridge is fit to the body very well. But I'm getting a "sitar-like" sound from one of the D strings and both A strings. Also when these strings are played open, after a few seconds the note changes to a much higher harmonic. The E string also sounds a little muted. I tried to file the nut slots a little wider. I would appreciate any suggestions on how to possibly solve this problem.