VPI SSM lacking bite

As usual your arguments make sense, I will try the springs. Now, any suggestions about what springs I should order for aprox. 300 lbs divided by 4 springs, ie. aprox. 75lbs per spring?

The springs I use are McMaster-Carr P/N 96485K125. They are 1-15/16”D x 4”L and use .148” diameter wire ground flat at the ends. They compress 23.7lbs/inch, up to a total deflection of 2.88”. So a 50lb load compresses each spring about half way down and leaves .88” of unused travel before the spring binds. I use six of them to support 200 lbs. This elevates the load 2.5" and provides a soft low-frequency bounce of around 2-3 cycles per second. For damping the central windings are wrapped in cut sorbethane also from McMaster-Carr. If you take this approach, get one of the stronger grades of sorbethane, as the thin stuff tends to split and unravel.

A very effective turntable mounting platform can be made from multiple sheets of MDF. I have 3 3/4" sheets with Blutak between them at each corner fastened together with brass screws under my Aries. The platform rests on Audio Points on top of a TNT platform and works well. Noel at Skylan Stands suggested this to me.