Thanks for the graph. I agree that the "narrowing" of the gap between slowest and fastest is based on fundamental physical limitations. The "premature narrowing" at 6 balls is, I think, due to the fact that jugglers haven't intentionally tried to do fast and slow versions of 6 balls (unlike 5 balls), and that 6 balls is generally less popular than the odd ball patterns, at least for endurance. I found those 6 ball videos through searching for every video of a 6 ball over 1 minute and taking the fastest & slowest.
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