Marc, I followed this thread when you first started it. I have had similar revelations until I tried something different and was able to pull out even more iotas of audio goodness from a well performing component. You cannot know what is missing until you discover it.
I had thought that I had reached the potential from my turntable when I installed the right thread replacing the non-stretch belt. Then I started experimenting with thread tension and finally thread length. The result was an ever increasingly convincing presentation.
The Stacore may be the best solution for you. Have you experimented with what the Stacore sitting on and what is between the feet of your component and the top surface of the Stacore? Who knows what you might discover?
The 90kg Stacore that isolates my TT sits on a 50kg inert slate stand direct onto the floor. My modded TT Permali/aluminium sandwich plinth uses Stacore footers. Not much scope for experimentation here.
My newly installed CDP is using Symposium Rollerblocks under, onto the Stacore, platform direct on the floor. I guess there's scope for different footers, or even something like a Symposium Svelte shelf, under either or both the Stacore or CDP.