It's funny - all I wanted to do was buy myself some new pickups for my 40th birthday. It's turned into an odyssey of tone discovery. I have not only changed my pickups, but have discovered new tones, rediscovered unused amp settings, rethought my pedals, changed to 50s wiring... and now I'm addressing power and shielding issues for the first time!
It's likely that I just never noticed the power issues before, but I think my tech did some sub-par soldering, as there was a lot of noise. I touched up the soldering which fixed it somewhat, and there is now only a slight difference when I touch the bridge. However for the first time I am getting a nasty buzz (not hum) when the axe is at certain angles to the amp. I've never really had this before. It could be because I scraped a lot of the side shielding from the HRD when I put the chassis back in after speaker change.
I've ordered some copper tape AND some conductive paint. I plan to shield both the cavity and the sides of the amp around the chassis.
I also have quite long leads coming from the triple shots... could this be acting like an antenna?