I have a MIJ P Bass that seems to have a bow that I can't get out. I have tweaked the truss rod played with the saddles, even tried shimming the neck but for some reason from the 18th to 20+ frets are higher. It seems the bow starts somewhere around the 12th fret and heads toward the body, the rest of the neck seems fine. Any ideas? And yes I have tried the sticky's up above.