Congratulations on a great system. Also thanks for posting your system with pictures. It's very helpful for thinking about your situation.
There are any number of threads on this topic, but I would strongly recommend that you reposition your equipment rack so that it is not between your loudspeakers. Hopefully this will also move the turntable so that it's a significant distance from the loudspeakers. Do a search of the the archives on this issue. The short version is that a large rack between the loudspeakers diminishes the soundstage/imaging performance of the system. I suspect your loudspeakers effect your turntable more via airborne sound waves than any structure coupled vibration. The only real solution is to move the loudspeakers farther away from the loudspeakers.
As far as a specific isolation platform, I would ask the people at Clearaudio what they recommend for your specific turntable.
There are any number of threads on this topic, but I would strongly recommend that you reposition your equipment rack so that it is not between your loudspeakers. Hopefully this will also move the turntable so that it's a significant distance from the loudspeakers. Do a search of the the archives on this issue. The short version is that a large rack between the loudspeakers diminishes the soundstage/imaging performance of the system. I suspect your loudspeakers effect your turntable more via airborne sound waves than any structure coupled vibration. The only real solution is to move the loudspeakers farther away from the loudspeakers.
As far as a specific isolation platform, I would ask the people at Clearaudio what they recommend for your specific turntable.