just got a 5string hh stingray . played it at a gig and i ws blown away , rest of the band couldent believe it . the trrouble im having is that i like my action as low as posible ( OK SO IM LAZY ) . i took down athe neck a click and lowered the bridge . everything is great untill the 12th fret . the b is ok , e okish, A theres real buzz problem, d ok and e fine . have i done something wrong . setting up guitars is not one of my strong points are there any pointers or words of wisdom that can help ?