Under my tower speakers -- Isoacoustics Gaia, other options?

I finally figured out how to post a picture.  This picture shows my spring platforms that I made for my speakers which I now use on my HT subwoofers.  Trickle down.

I am considering the Podiums for my 185lb speakers. I live in an semi-active seismic area (San Fernando Valley). I currently use Legacy spikes on a very thick carpet/pad over a 12" poured concrete 3000psi steel reinforced slab. The podium could add greater stability and probably more defined sound (it’s already quite good).  However, the C type podium at $1800 price is 75% of the price of my speakers.  Probably worth it.

I tried Gaias (borrowed from a neighbor) under equipment. I prefer Ultra SS Stillpoints and Synergistic Research MigSx. I have ordered Pods for my CD transport and Platforms for both pre-amp and amp. It’s possible to upgrade my vibration isolation with Townshend products. I’ve been using the wonderful Seismic Sink under my terrible non-isolating VPI TNT VI for 17 years (pump it 5 pumps every six weeks-no big deal).

Have you seen this video where three guys try the Townshends, Gaias,and Prime Acoustic platforms? It's very long but informative as they try different configurations. The floor is concrete with wood overlay.

I watched as much of it as I could. 

It's tedious,yes.The men aren't exactly dynamic personalities. But I could definitely hear the differences in the tracks they played with the different products installed and was surprised by which combination I preferred by the end.I'm actually beginning to start the process of trying different footers and platforms. My floor is wood over a basement though so not applicable to your setup.