they apparently found it tuff..
https://www.youtube.com/watch?v=dOlxow0l8bE
https://www.youtube.com/watch?v=9ZbGoiyZ8wQ
That is anecdotal evidence. More the result of learning curve phenomenon. Seriously... How else was Sigel of that year gonna beat schmidt of that year?
Id theorize slower cloth provides a more favorable margin of error for measures of speed control...a +10% power error would lead to being less distance from target on slower cloth.
Yes, one gets more length on simonis than on backed/ napped/ 21oz...but how often do good players really move the cb large amounts?