The Gates Carbon Cord belts work well for performance and consistency....I ran them on the cat, the doo 1200 loved them. But the cat could eat them fast. They are a softer belt aimed at performance. Dont expect it to last any longer then a 8JP. Similar in cost too. But Gates comes with a 1 yr warranty so you can get a new one.
I believe the way to go is to run the MUCH CHEAPER 8DN($55) for trail riding day to day....Pile the miles on the cheaper 8DN and set your deflection up so it rides like a DOO belt, Top cogs over the 2ndary. Then run the 8JP for radar runs and any time you need all your top speed. 8DN is a very hard belt, compared to others.
What I hope for more then anything...is the clutching works properly, efficiently so the belt life is back to Yammie type expectations...Glide washers IMO are a MUST for any setup, even stock....Since the stock LONG primary spring tended to BREAK last yr due to binding(over 3000 miles or so)....Clean up those spring seats in primary, add 2 glide washers(Lonn sells them) and likely cure that issue.
Dan