I just installed my first set of Thomastik flats. This was all done in the usual way, avoid twisting and stretching etc. I've found the G is completely dead and the A has a horrible rattle somewhere around the nut, this is not fret buzz as I've adjusted truss and setup to suit the lower tension. I've been running D'addario chromes for many years without a single problem. Did I get a bad set? Any advice?