The urge to tinker is awash. What TT might better mine and why?

Seems like there are mixed reviews on your table. If I was starting from scratch, I would look at a 301/401 with new massive bearing and heavy platter in the right plinth with a top notch arm. I don’t know your budget but as a starting example of cost, my rebuilt 401 with custom idler in a slate plinth and decent arm set me back less than $4k. It sounds wonderful - musical, transparent, resolving, and utterly involving. It is also a respected reference class transcription table that has stood the test of time.

Sure thing on speaker position. I was thinking of moving the rug! Fair enough if they are spiked through. I wasn’t sure.
I enjoy Tidal streaming too but find, in many cases, my vinyl rig is more enjoyable especially with my collection of analog recordings. I heard the Space deck many years ago in London and thought it was okay, somewhat dark and unexciting. I felt that others, at the time, namely the Rock and Oxford Acoustics were better. I understand it’s been improved since so probably a moot point. Nevertheless, if that is the house sound, it's not to my taste. 

@dmix I believe the OP has the GN power supply.

@uberwaltz Why not try moving your speakers onto the tile for better rigidity? 

Belts are elastic. Stylus drag is real. ;-)