Upgrade from TW Acustic Raven AC-3 to what?

Alectiong, I agree with your present course of trying to perfect or improve upon what you already own. Along those lines you might want to consider the heretical idea of going backward to only one motor driving the Raven AC. If you go that route, you might also consider the introduction of a passive roller to wrap the drive belt more closely to the circumference of the platter. (For example, take a look at what is done with the new Artemis Labs turntable.) One of the other forum members has made a similar device for use with his VPI turntable, and he is very pleased with the improvement. This strategy reduces belt creep, a bugaboo of belt-drive. A machinist could make the needed part for you. Alternatively, you might consider driving the platter with an outboard idler wheel, a la Teres rim drive. (Dertonearm is sure to jump/dump on that idea, and even I have my reservations about the particular way in which the Teres rim drive was designed, but reports from end users are in general favorable.) These ideas would be in addition to suggestions submitted by others, such as use of Minus K, etc. In any case, I encourage you to "think outside the box".

Using a rim drive will make all efforts for minimizing outside vibration coming towards the platter and thus towards the tracking process obsolete in one single move.

Ain't that the truth. Funny how so many end users find the net result to be simpatico. I am an agnostic, haven't heard it. But I do love my own Lenco L75 with PTP in slate plinth. I am sure you have made an uninformed negative judgement of that as well.

TW BLACK NIGHT!!

"Ain't that the truth. Funny how so many end users find the net result to be simpatico. I am an agnostic, haven't heard it. But I do love my own Lenco L75 with PTP in slate plinth. I am sure you have made an uninformed negative judgement of that as well."

Careful Lew. I believe we are standing in the shadow of a 21st Century Tesla here. ;)