That I don't know Pat. I also think your point is very important - at the moment, there are very few who can shoot the weight Joe does, so that may be the reason he's at the top of the distance tables. My point was that all we know right now (hence why all the online debates are somewhat moot) is that he set his records while using the rolling loose. It could be a load of rubbish, but we need to have side by side comparison with static looses to know. Until then, this topic just circles over and over again. Blacksmith77k went to great lengths to help towards this last month on a different forum, but I'm not sure even the video evidence made the non-believers change their mind.
I guess the way to answer your question is to ask somebody who was at every record attempt. If they can verify that the rolling loose was used throughout the weights, that may go some way towards a better understanding.
The records for the English society is on the website, not sure about the others.
Strings - there's an important article on its way regarding strings (and something else massively overlooked but now focused on within the EWBS) and that will be out soon. It may even be on the website now, I can't remember if Chris put a link to it yet or its still being sorted. Either way, anybody who thinks the strings could only support light bows are gonna need a new topic to argue about! I know that doesn't answer your question - sorry! - but I think more people are leaning towards natural strings, and I imagine they definitely will soon.