The problem is the VP! Scout has no suspension, and the approaches you've taken to solve your problem don't acknowledge that fact. Solid Steel racks are, as the name suggests, pretty solid---stiff, passing the mechanical energy from the floor into the MDF plinth of the VPI. The MDF shelves on the SS rack flex (I know, I own four of them), but not enough to create any isolation between floor/rack and turntable.
VPI's first product was an isolation platform---a wooden box with no bottom, springs installed in the open cavity and facing the shelf upon which it was placed. It was reportedly pretty effective, but finding one may be difficult.
So, as suggested above, try a set of four springs between the top shelf of your SS rack and some sort of platform for the VPI. Symposium Acoustics makes a platform designed expressly for turntables; it is a multi-layer shelf-like plank (aluminum top and bottom, foam rubber between the two) fitted with special springs on the bottom. Worth a look on the SA website.
VPI's first product was an isolation platform---a wooden box with no bottom, springs installed in the open cavity and facing the shelf upon which it was placed. It was reportedly pretty effective, but finding one may be difficult.
So, as suggested above, try a set of four springs between the top shelf of your SS rack and some sort of platform for the VPI. Symposium Acoustics makes a platform designed expressly for turntables; it is a multi-layer shelf-like plank (aluminum top and bottom, foam rubber between the two) fitted with special springs on the bottom. Worth a look on the SA website.