Was a record on TT while you measured?
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What issues are you referring to? Both belts appear to be quite accomplished in terms of speed accuracy and W&F. I imagine that the determinant of sound quality is the specta of noise that is passed from the motor to the sub platter via the belt, not speed stability, that will be the determining factor in perceived sound quality.
Just because you can measure something doesn't mean that you can then draw a line assigning sonic causality to that measurement.
I have a RP-6. Bought a white belt and seriously I can't tell any difference between it or the supplied black belt. As far as I'm concerned, I feel I wasted $59 on the white belt. My observations are based solely on listening and not by testing and measurements. About all I can say is I now have a replacement belt when the white one wears out.