When I was having footfall issues in my office setup, the ISO Acoustics pucks didn’t do jack to help. A maple butcher block was also completely ineffective. The shockwave of heavy footsteps on bouncy floor induces a (relatively) huge displacement (mostly lateral) in your turntable / tonearm system. The displacement is going to excite every subsonic resonance (e.g. cartridge suspension) and cause skips. It also excites a Clearaudio ceramic-magnetic bearing, btw. And also their magnetic bearing tonearms (good luck with that lol).
Spring suspensions (and maybe roller bearings) can help to some degree, but they won’t always be enough it if the problem is really bad. The old "bang a hammer straight down on the plinth" test is NOT a good simulation of this issue - though it was great gimmick for selling tables! Other platforms (e.g. butcher blocks, HRS, Symposium, CMS etc) and isolation feet are completely useless here. Bracing the rack against a strong wall, or a solid wall mount, is the only "real" solution in these scenarios - because they’re the only techniques that limit the displacement. One of worst audiophile "anti-patterns" might be sticking a turntable atop a tower style rack, unbraced.
But OP’s problem is NOT that. It’s a resonance - in the audible bass frequencies - which I’ve noticed myself in the VPI arms, especially the 3D printed ones (especially the earlier ones - it’s a bit less on Fatboys).
You know, a lot of people switched from the VPI metal arms to 3D printed and commented that drums sounded so much more real and powerful! Well, guess where that resonance frequency is positioned and and what it sounds like...lol.