Has anyone had trouble with speed on their tt

Kiddman, there are no motors or turtables with absolute speed stability. Every motor is subject to "kick & coast" - the effects of which cannot be completely removed. It would be nice to think it could be engineered to be 100% non-cogging but it can't.

Even high-tec radical solutions to compensate for inherent issues of suspended chassis tables such as the Kronos which uses counter rotating platters are still flawed because the basic engineering cannot be accurately balanced e.g. weight & tension of materials etc.

To give another example, an Avid Acutus would be one of those poor candidates you mention but I would cheerfully buy one today.

"corrects for drag instantly...."

Not possible. Instant velocity change to the correct velocity would be like a perpetual motion machine.

Fast correction = flutter.

Slower correction = wow.

Slow correction = drift.

All affect the music. Correction (servo circuits) are bad for this application. It's why no master tap machines used them, which is directly addressing the OP's stated problem, his DC turntable's speed problems. DC motors need servo circuits, and those are very compromised for this particular use, high end turntables.

Everyone thinks they have great speed stability in their turntables until they hear one that does, then they wonder why the stable one is so clear, so natural, so right.

No i have TW AC3!!

Syntax, Mosin, and Hiho are correct. What a motley crew.

“Slow Death by Timeline .”
I’m not a turntable designer but taking servo controls out of context without considering that flywheels and rubber belts influence stability is, to my mind, misleading at best.
To assess a design you need to look at the whole design not just one element of it. Anyone not doing this has an agenda.

In the best of humour, to the Timeline Fanatics, I’ll play one that beats you .
A digital system, when the output is rendered, has a perfectly clocked timeline. It has an accuracy that no analogue system can match and is far better than any Timeline tested example.
The level of jitter is usually, at worst, of the order of hundreds of picoseconds or a nanosecond. This equates to a vanishingly small speed error.
Does this mean that the pitch stability of my digital replay is so good that I instantly comment on it and prefer it to those turntables of “ill-repute” deemed unworthy of merit?
H*LL NO!!!!!!!!!!!!! :D ;D
Those “unworthy” turntables are by far preferable and pass the only test which is important : they involve me in the Performance to the exclusion of all else.
If, as a result of Timeline inspired disillusionment, anyone would care to sell an unworthy turntable of ill-repute at a knockdown price, I’m here. ;)

Of course, Timeline fanatics could, if they wish, dispense with the LP altogether and watch the turntable rotate in preference to listening to music?
The Timeline hype reminds me of the Philips “Perfect Sound Forever” marketing blurb which obsessed about surface noise on LPs. Before you knew it, every listener was holding their breath focussed intently, not on the music, but waiting for the next click or surface imperfection to occur. At a stroke, the marketing changed everyone’s perspective. They had successfully persuaded most of the consumers to stop listening to the music and focus on background noise instead. It took years for the population to re-learn that analogue wasn’t so bad after all.

We don’t really want to go there (again)? (Do we .?)