Just did that to all guitars. Just for peace of mind. Thanks for the advice, Narco!

I'm going to prepare a big post with the details necessary for others who are dealing with these groudning issues. I'm receiving all sorts of emails from Peavey, Marshall, ZT, Tech 21, Blackstar and Radial on this. There's a lot of info because there are a lot of unique cases that these companies are inundated with. I've also got some of the senior folks at Skywalker Sound involved. They've got a lot of stories with weird noise, let me tell you!

Anyway, I'm on it. Compiling information. I've found a solution that works and is compact. I'm testing it now to see if it works everywhere I can have access to. I'll post when I'm ready with enough info.