Lately vibration isolation has become the foremost point of interest in my system. After dealing with everything else, I find tremendous sound differences in using various isolation products under every single piece of equipment in my system. Once you get to a certain level, it is a real thing.
SOLVED: Room boom
I have raised wood floors and VSA Ultra 55's (active edition) with Critical Mass footers. Tracks like Boz Scaggs' Thanks To You would cause the floors to physically vibrate so much I could feel it through the frame of my listening chair even with the VSA bass gain to lowest setting.
TL;DR I added these these $30 vibration pads under the CM footers and they totally cleared the vibrations: https://a.co/d/fvC3av5. I'm also getting better general depth & clarity.