I'd be very surprised if there was any additional noise from Mike's bearing with a heavier platter, since it is so well engineered. Whether the motor controls need to be adjusted to take into account the additional mass is not important, since the essential parameters can be easily altered by someone who knows about these things.

The copper mat thing interests me, even though I no longer own a Technics deck. Does the copper mat work because it, in effect, provides the mass and rigidity that the standard platter patently lacks? Mike used to use a copper mat "stuck" down to the standard platter using silicone grease - does the new machined platter move things along significantly? I would venture an opinion is that the flimsy interface between the Technics' alloy chassis and the main bearing housing is a more fundamental issue than the limitations of the standard platter; also it is clear (to me at least) that one of the reasons why Mike's bearing works so well is that, because it is very strong and utterly rigid, it imparts strength to that part of the chassis that did not have it before. It's also a very fine bearing, of course!

It does look more and more like the motor from the Technics is the only bit worth shouting about!