Isolation Platform for my Sota Cosmos?

I wouldn't have thought that isolation would be a big deal with a Sota tt since it is suspended; but I was pleasantly suprised last night with a tweak that I made to my system. Years ago I had my tt sitting directly on a granite slab. After reading some threads I placed a wood board between my tt and the granite and heard a nice improvement in sound. So I knew then that there is some interaction between the base and the plinth. Well, my tech at work has a few blocks of black, dense open celled foam sitting around that was used as packing material for something that we received a while back. This stuff is very dense. It occurred to me last night that this might make for some good isolation material. These blocks are 1.75" thick and two blocks wide is just a bit larger than my granite base. I placed these foam blocks on the granite and then the wood board and tt on top of that. The foam is dense enough that it barely deflected under the load. In fact, my tt was still perfectly level. No adjustment was needed.
Right away, I could hear the difference. Images are more focused and the base is tighter; tighter like a CD. I'd even swear that the surface noise got quieter. It is a remarkable improvement. Much more than I expected to hear being a suspended table. Luckily, this dense, black foam looks good sandwiched between the granite and the wood. With so little deflection in the foam; there is no bulging of the sides. Good thing because I am not taking it out.

I posted a picture on my system page for those interested in how the foam looks sandwiched between my turntable and shelf. I'm still enjoying the improvement it made to the clarity of the bass and the more focused images.

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I have a suspended turntable and recently bought a self-leveling Vibraplane to place underneath it. The improvement was clear. I then ordered a custom steel ballast plate which weights 136lbs. This is large enough to also place my motor controller on it. This increased the performance even more. I have a very solid, rigid DIY rack with lolli columns in the basement supporting the floor under the rack, so there is no bounce to my suspended wood frame floor.

Proper, serious isolation solutions are a very effective way to improve turntable performance, even if the turntable is a suspended design. Photos can be viewed on my system page.

I had better isolation under my tt years ago and drifted away from that. Somehow, years ago I thought a granite base would be advantageous. I then learned some time ago that the tt sitting directly on granite was not a good thing. Now I have learned over again that the more isolated my tt is from the granite the better. I have listened exclusively only to vinyl the past few weeks having a rediscovery how good analog sounds. The bass is once again crisp and deep; as good as or better than digital. Imaging is tack sharp. This past Sunday night I was listening to Dark Side of the Moon. I was delighted to experience the holigraphic sound stage of this album again after several years. The oval pattern of the sounds moving left to right and back at the beginning of the record was very apparent; as well as the oval pattern in the footsteps on the next track.