Springs under turntable

@mahgister- I completely agree with you on loading a spring to 3% of its max spring capacity to get the max isolation. I am also working with springs for sometime now. I face two issues when working with springs
1. Spring rate. If you want to get the isolation start around 3-5 cycles for a given load then you have to select springs of very light spring rate. That would lead to using more springs underneath a load and it tends to make the sound harsh, a symptom of ringing...
2. It's important that each spring underneath the load carries equal weight which should be close to 3% of the spring max load bearing capacity. In reality most of the electronics have asymmetrical load and it makes the positioning of these springs difficult underneath a load and very difficult when isolating heavy components like amplifier.
That is why I haven't spent a lot of money in buying a commercial product like Townshend or Solid Tech which would be super expensive yet not solve the 2nd issue.
What I need is a product that would be able to weigh a component and get me the CG location along with its weight distribution in quarters. That would allow me to design & also position the springs underneath any component accurately and w/o any guess work.
Thanks.

I have Vandersteen 5A's....I read somewhere at one time that if I decouple the speakers from their spikes on to tile-on-concrete flooring using (maybe Herbies somethings), I would get better sound.   Nope....took all the music away...replaced the speakers on the floor. That's just me...

@millercarbon Good. I think you should lose the granite. I tried granite under table, under maple and table, above maple, and every time it sounded bad. Removing it was a relief.

Uberwaltz, I also noticed reduced bass and somewhat thinner sound. The weird thing was that the sound improved the next day with the tonal balance evened out. If you try the springs under your table, give it a few days to judge.

millercarbon, please recall what I said about substrate, the more unyielding the substrate, the higher percentage of the energy will deform the springs.

Did you ever bolster the floor, specifically directly under the places where you have springs isolating your speakers?

One suggestion is to use the granite laminated to MDF, I haven't tried it, however I suspect laminating MDF (or some pretty hard wood?)  to it top and bottom, will change it's tone from ringing significantly. Use the granite under the TT, atop a shelf on your rack with appropriate springs to isolate? Sharing the kenetic energy between multiple absorbers, are you sure you want to do that?