Thanks for the vid QQ. I don't have to take mine apart now and find out why it moves the way it does.
Mine does the weird '2 outer layers moving at once' thing really badly so maybe with a little sanding, really precise tensions and the right lube might help with this but I'm not expecting the 6.2mm version to be breaking any records either but we can hope they tweak their prototype enough to make it a contender.