Let me first say that I understand how a truss rod works, and how relief can be added or decreased by loosening or tightening the truss (respectively). I also know how to measure relief. That being said, here's my problem... My new bass buzzes over a three fret area. Frets 8-10. I tried to add a little relief to give the string clearance because I believe the bridge saddles aren't too low. I keep loosening the truss nut, and I'm not getting relieve with the bass in tune. Even with the truss nut completely loose, I'm not getting enough relieve. I have a capo on the first fret, I'm holding down the string at the 15th fret, and the string barely clears the 8th fret. I'm not getting that business card thickness I'd like, even with no truss tension. What should I do?! Does my truss have a reverse bow or something?