First I've seen of this cool device, great concept. Every high end TT manufacturer should use one during product development and QC testing - if they dare.
All Teres belt drive tables self-compensate for drift by monitoring a built-in platter strobe and tweaking motor voltage as necessary. This system should maintain overall speed accuracy to well beneath the resolution of the Timeline, since the platter strobe read by the motor controller has more marks per revolution. However, only a few tables have that ability to directly monitor PLATTER speed and self correct (direct drives presumably, but not many others).
With regard to different LP's, I suspect stylus drag due to differing dynamics affects speed more than the mere inertial difference between 120g and 200g records. Once the platter's at speed a heavier LP would help slightly, but 80g more weight is pretty tiny compared to the weight of most platters, especially the 30-80 lb. monsters some of us use.
A ring clamp provides much more inertial benefit than a heavier LP: it weighs alot more and that weight is all out at the periphery. No surprise yours made a visible/audible improvement.
Of course a once-per-revolution strobe cannot measure short duration speed changes that occur and correct in less than a revolution. Short transient rise times occur in far less time than this. Still, steady-state speed at the right speed is certainly laudable - and audible to many if it's off or (especially) changing.
Good report, sounds like it could help many of us make audible improvements ... or change TT's!
