Mojo is on his own, I am the new low noise floor boy
I actually am leaning towards isolation, not noise. I think that the base of the TT was sucking the low frequencies out of the platter. The grease added in a layer of isolation. The problem with that is the grease migrates out and needs to be replenished.
This is where Clear Audio German Engineering might be on to something. They use magnetic suspension so that the platter is floating.