@rtilden If you're speaking to me I'm loathe to give advice on specific isolation needs. As mentioned previously I've experimented with a wide variety of isolation devices over the decades, I've chosen specific devices based on the exact voicing I'm looking for, my needs may change over time which is why I keep a wide variety on hand.
General advice, the lps for digital equipment isn't that important in the whole scheme of things. Dac is important, sounds like you could use some improvement here, should sit on something more substantial and then add the footers. Most around here seem to use the Townshend or Isoacoustics Gaia's under speakers, don't know about the Stacks with those spikes, people seem to prefer isolation from floor vs coupling to floor. Best isolation for me with turntables, tube preamps, amps has been Stillpoints. My entire system sits on a 2" concrete slab on suspended floor which has been supported with multiple floor jacks, no tall equipment racks, everything on custom sand boxes, top plates use steel, various thicknesses of aluminum with custom vibration sinks or various woods, which top plate chosen depends on voicing I'm looking for. Then all the various footer combined with various top plates in order to attain voicing I'm after. So now you see why its difficult for me to give specific advice. Experimentation is the only way you'll find what works for you, sounds like you have a good plan thus far.

