ive been giving this some more thought, could it be something inside your bridge rattling or buzzing?? if you slackend the truss rod right off it could be that buzzing, the nut could have come off the rod?? check for things on the guitar rattling/buzzing, maybe its nothing to do with the setup itself, maybe a loose peice of hardware?? check all the screws are tight, and a twisted neck is unrepairable, well it is repairable but you would find it more economical to replace the neck.