I don’t doubt your experience but I’m saying it’s all relative, and I don’t know how adjusting the slugs changes noise in a Dyna, but maybe it does and I never noticed. I prefer single coils and the worst of the bunch are most P90s and an unshielded Jazzmaster pickup. They seem to be RF antennas on the side. Dirt/volume are only going to multiply the annoyances. FYI, I noticed many of my modern Gretsch Dynas don't have a grounded cover, which could make things worse with hum/interference. TVJs, just about every other Dyna I owned have grounded covers. Still, Shielded wire eliminates the need for cavity shielding but unless one goes nuclear with copper foil, the coils on top and bottom remain open to RF interference.