On my mexi fretless jazz, with the seasonal change, there was quite a bit of bow (middle of neck farther from strings, than near nut & body, like a smilie face.) I did about 1/4 turn counterclockwise one day with slight improvements. And 1/4 day then next and it seems that a ton of slack in turning the truss rod came about. So i moved it back clockwise until where there was a bit more force needed to turn it. Is it that my truss rod can't be turned anymore counterclockwise? Is there any way to fix it that isn't as expensive as buying a new neck?