I recently restrung my Strat. I bought each string individually because I mix up the gauges according to my preference. Anyway the low E was a .056. Compared to the other strings (the guitar is tuned to standard) it sounds dull and lifeless and totally lacking in sustain. Is this a problem with the heavier gauges, that it would sound different? Or could it be because perhaps it had been sitting around for a very long time, maybe in the owner's shop for many years? Or could it just be a dud string or something?