As an "expert" on LACK of leathers, I think you should wear them. The no perforation, etc rules appear to be oriented to 'liner rider/drivers, where it makes perfect sense. For sit-on bikes, it seems to me that a different set of rules should apply. In liners, maybe fires are the most important thing to worry about, where on sit-ons it looks like abrasion and general bouncing along or getting run over by the bike is more likely. Perhaps the rules folks should re-evaluate the purpose of leathers for the two situations. By the way, I never used graphite on my back - I just had a really good tan from wearing a bathing suit on the salt for a few days. The tan got left on the salt. I read a report in the mid-50s that said that leathers were a few miles an hour faster than bare skin. I wish I had known about it.