Honestly I have never noticed any hum issues when soloing a pickup at a gig, although I do usually just marginally favour one. This is despite having issues with my Fender jazzes. Your later point about gig noise hiding it may be valid though. There was an earlier discussion where several Will Lee owners commented favourably on the the same point.Keep in mind, single coil hum and shielding/grounding issues are two separate things. Yes, I'm sure the shielding is done right, so when you're using both pickups it's silent, but there's no way to eliminate single-coil hum, so when you favor or solo one of the pickups, you're always going to get some hum.