Hi, ive recently acquired a 2nd hand fretless bass and the action is driving me crazy. Its preventing me from getting the low action i desire. Now, heres the problem. the neck is straight from the 12th fret to the 24th fret, but from the 1st to the 12th fret, its sorta like and up down hill. From the 1st to the 5th fret, the fretboard goes inwards, such that the action is lowest at the 3rd fret for this area. From the 5th to the 12th fret, the fretboard goes outwards, such that the action is highest at the 8th fret. Ive tried tightening and loosening the truss rod several times, but it doesnt change the shape of the fretboard from the 1st to the 12th fret. All it does is give the general relief. But even with up-bow or back-bow relief, my action has to be absurdly high. anybody know anything about this..