While the rack should provide isolation, you might want to check the tubes in your phono preamp and see if you can identify and replace the one(s) that are so microphonic.
Artesania rack
Hi,
I use artesania krion platform on top of two shelves exoteryc rack. When tapping on the krion (with turntable removed) there is a metallic ringing sound that is heard from speakers. It comes from my tube phono preamp which stands on the lower position of the rack. Same exactly sound is produced when tapping directly on the phono preamp. But this should not happen. Krion turntable platform is considered to be isolated from the inner structure of artesania exoteric rack.