Turntable and Rack vibration control


Hi,
I moved from a Nouvelle Platine Verdier to a Loricraft Garrard 301. The big change with this move was that the Verdier comes with a terrific implementation of pneumatic suspension feet which kept the TT almost floating and hence great isolation from vibration. The result was always a noise/grain free playback and super clean backgrounds. With the Garrard, the plinth is typical custom made stacked birch ply with standard steel cones as footers. When placed directly on the rack the background is noisy, the images muddle up and overall music is not well sorted.

I do not expect the Garrard to be as quiet as the Verdier but I know it should not be this noisy either. In fact the Verdier also sounded noisy when I placed it directly on cones bypassing the pneumatic suspension feet. 

I use a Hutter Racktime rack which is not like an overbuilt audiophile rack. It is more like an open frame rack with lightweight supports. It is a bit like a Rega TT, not very damped or controlled. The rack has pointy steel feet which rests on brass spike plates (mine is an wooden floor). I guess this implementation is not sophisticated enough to keep away vibrations and let the TT play quietly. 

I am looking at two levels of solutions:
1. Replace the existing steel feet and brass plate with a quality vibration control footer below the rack
2. Replace the stock steel cone below the TT plinth with a better footer/platform.

I have tried Sorbothane, Squash balls kind of tweaks, while they reduce noise they slow down the music too.
I have also tried Stillpoints and Finite Elemente footers under the rack. They make the sound thin and metallic IMO. Platforms like Minus-K are too expensive so I have not considered them yet.

I am looking suggestions here, probably footers and vibration control devices that are more musically oriented yet well engineered like Shun Mook, Harmonix, SSC or something like an HRS platform ?
pani
I use a 100lb concrete block, then a sheet of felt, then a marble counter top, all mounted on a heavy duty butchers block table with DIY spikes underneath. I have a pier and beam house, but I paid some kids to crawl under the house and install some DIY supports under my speakers and equipment rack. Works for me.
Everything should be isolated. Not only audio components and speakers but all the heavy items in the room, chest of drawers, bookcase, couch, big overstuffed chairs. The most cost effective way to isolate furniture is with Small DH Cones but any cones will suffice. Super DH Cones are probably not (rpt not) cost effective but would be the best sounding. Maybe check the tweak closet for any cones you might have tossed in there.

Symposium is working wonders on my system.  I just put the KAB regulated power supply up on Rollerblock Jr sitting on top of a Svelte shelf.  For me, I heard more depth and decays have smoothed out.
You got to push the platter with Nottingham turntables to get them started, and stop them too. Motor has just enough power to maintain speed. The same with Pear Audio turntables. Dynamics is not an issue, I repeat - it is not.
However, with such a dirty and unstable electical power you do need a motor controller. I use PS Audio regenerator for the entire system for now. What I do hear from time to time is that recording and mastering engineers were having kind of fun and as a result recording speed is not quite right - on LP, cd, computer - doesn't matter. Not to mention that they at times positioned microphones too far or too close and used piece of junk cables. And perhaps they also forgot to clean recording heads before recording.
In another thread someone suggested Herzan active isolation platform. Anyone tried it ? It's $10k Swiss stuff. Looks serious. Definitely not this Symposium or even Minus-K, I suppose. Hard to speak for every set-up, though, I guess.