Isolation methods for your VK50SE preamp

I recently added a rack and two amp stands for my monos for my two channel only setup. The rack was a gift from my carpenter. It is basically diy made from doug fir coated w/ black lacquer.

I had no idea a rack could make so much difference one way or another. My system had already reached a new level or transparency and intimacy. I really didn't "need" the rack except that the installation looks better. All components sit between my speakers.

This rack is a 3-component system with no top shelf. I would need to provide my own top shelf material.

The first thing I did was to just put the preamp on top (there is a bar/beam that goes from front to back). The result was astonishing.

While listening, I found that the preamp seemed to disappear before my eyes. There was no haze or chestiness that I sometimes hear only when compared to my Wadia direct.
The transparency and liquidity heard on that "one" night made me feel like my system had previously been in another dimension and finally melded with my own. I thought I had finally reached a new level of understanding as to what others mean when they speak of that cool tubey sound.

However, there are trade-offs. In my system, some of the extreme dynamics were softened. But the music was still clear and warm...very real and liquid with no seams or edges. Classical, jazz, and jazz vocals were incredibly real and live sounding to the point where I found my self lost in my idea of the venue several times. Scary.

I had grown accustomed to being able to hear "all" of the harmonic details and such. I began to see if I could have it all. I tried wood and granite platforms.

The wood was warm and somewhat transparent. The vocals were 80% fully audible and the dynamics were softened a bit but better than with no shelf.

The granite sound was clear as a bell. Every word from every cd I played could be understood. But the sound was more solid state in its clarity. It also lacked certain warmth that I had even when using the Wadia direct. Dynamics were ok.

I tried a combination of the two. The dynamics were back 100% to a level that I had never experience with this preamp. Voices are clear, about 90% fully audible. The whole presentation seems 100% right fundamentally. I can't really complain and wouldn't except that I had a glimpse of that tube magic and I want it back!!

Any suggestions for isolation that will allow for transparency and dynamics?

My system:
GNS Modded Wadia 861
BAT vk50se
BAT vk1000 monos
Sony 333es SACD player
Kimber 3035 speaker cables
Tara Lab prism 22 ic's (don't laugh I'm still saving up)

Romm is a suspended floor with floor joists over another room.
Thanks!