Dumped the rack


So I have a steel spiked Sound Organization table about 2 feet tall. On it rests a 3" maple butcher block. On that rests my slate Garrard 401 with slate feet and aluminum cones.
I had a piece of granite made and installed it on the maple beneath the turntable. Man, that sounded bad. Silvery colored and dull. I reversed the layer order and put the granite below the maple. That sounded a lot better. But not as good as when there was no granite. So I took it back out. Okay back to how it was. But something was missing. The granite did bring a feeling of stability to the image. What to do? I took the whole rack thing out of the equation and put the 401 on the concrete floor along with the preamp. This sounded best notwithstanding the wooden tone lost by removal of the maple. But the best thing, and I’m aware of the effect from reading but never tried it, was that imaging has improved by quite a margin. Like removing a veil of something. Like when someone moves their head out of your face at a concert. Now, I have to bend down to play records. 
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Thanks Geoff and slaw. I admit I've been avoiding the whole spring aspect of support as I do not have suspended floors etc. as the rig in on at least 3" concrete. So kindly tell me how to assemble a support using springs given I have a 60pound slate table. Thanks.
My Super Stiff Springs will isolate 60 lb. nicely. Just place one spring under each corner of the slate turntable directly on the concrete slab, no carpet. Easy as pie. 🥧 And they’re only twelve bucks each. As it turns out the 3” concrete slab moves too, just not as much as wooden floors, and at frequencies that interfere with the tonearm, platter and cartridge resonant frequencies.
The small problem is that the slate plinth is 2" thick and the Garrard is about 6" high so I have to raise the slate up on 1.5" x 3" slate feet. The plinth rests on three 3/4" aluminum cones which in turn sit on the slate feet. Would the Super Stiff Springs work under the 3" maple?
Yes. The Super Stiff Springs are very stable under load even when the center of gravity is on the high side. 
The issue some seem to have (without even trying them) is the fear of the springs leaning. This is a non-issue. If one wants to look closer at my system, I recessed the springs 1/8" into the receiving base platform and upper platform, negating any worry of spring leaning, or spring sliding.