@millercarbon
The best thing by far to use under a nice massive stiff table like yours is a set of Black Diamond Racing Cones screwed into Those Things screwed into the base.
I believe you tried everything to say the simple cones are the best?
But this is what everyone has by default, normally
Do you understand what is preumatic insulators such as AT616?
I don't know about any similar product on the market
Even Raul has been using them under his subwoofers (good idea) where the cones are most common solution.
Actually the cones are what we would like to replace with a better things such as Pneumatic AT616 or something different like Stillpoints for improvement.