If you want to get the best of your transport, try this.

Placing these small air tires works best for my equipments!

https://www.dubro.com/collections/tires-wheels/products/big-wheels

Like polishing a turd.  

Instead, just add a Synchro-Mesh reclocker and you will get 7psec of jitter no matter what transport you use, no matter what treatment you do to the disks, no matter what feet you put under the transport.  It will make any device a world-class digital source.  SM is more than $400, but the improvement is drastically better.

If you believe feet are a better solution than a really good S/PDIF coax cable, then you have tried the wrong cables.  Every cable should be 1.25m long at least and the coax terminated to BNC connectors, not RCA's.  Use RCA adapters when needed.

Steve N.

Empirical Audio

I've tried about a dozen different isolation/vibration devices, mostly high end types.  
I use mostly Stillpoints under my tube equipment and isolation transformer.  Which Stillpoint model was dependent on the component and often the Ultra Minis were best.
I also use Stillpoints under my TV cable box (what a difference), Bluray player (for the audio) and under my ADS speakers used for a video system (tightens the bass and imaging).  
I use a Townsend Sink under my VPI TNT VI.  A MUST! (VPI TNT feet are wholly inadequate)
I used a buckwheat pillow under my EAR 324 phono pre when I used it.  Buckwheat pillows are also a CHEAP and EFFECTIVE alternative to all the mainstream isolation/vibration gear, even if it isn't 100% as good as some, it does a good job at low cost (but not aesthetically pleasing).

You must try Machina Dynamica Springs. I have them under everything except my speakers. They isolate in all 3 dimensions, and are inexpensive

If I remember correctly one member swears by full Del Monte Fruit cans. I don’t remember if orange slices were better than pineapple, but it seemed smart to start with four, in case you got hungry, you could still hold your equipment up with three.

BTW, I use some Steve Blinn footers, but it looks like Steve is out of business.