Just outta curiosity, do your guitars have any level of fret buzz? I mean, when properly set up, do they buzz acoustically, even though the amp doesn't show it? My guitars are often set up by techs and my strats do buzz unplugged (and it's no issue to me, electric guitars are meant to be played plugged in). My Rickenbacker doesn't, or at least not so much. I use light gauge strings, that may contribute.