Hi! I've finished my 4th build some days ago and I'm having some troubles with the strings buzz. The bass has heavy buzzing on all strings from 4th-5th fret to 10th one. Both nut and bridge are set at the right height... you'd tell it needs more relief, right? This is what I was thinking too. It's a 34" scale (set-in) and the neck is quarter-sawn Ovangkol. Pretty thick (almost 1"+8mm of fingerboard). I've used a 2ways truss rod but even if I try to get a relief with it the fingerboard bends in the wrong area (from the 3th-4th fret) and there's no gap on the 12th fret. The truss rod starts right under the 1th fret and it has the nut on the heel of the bass. So these are my ideas... 1) Neck too thick in the 12th fret area and the strings and rod can't bend it; 2) The truss rod should have been placed starting from the 3th fret?! 3) I've been a war criminal in my previous life and God is simply giving me what I deserve Any idea? TIA.