I wore out the stock clutches.
I tried lots of setups. 1015, 1016 & 1017 springs. 2004, 2005 and 2006 weights. Tried every combo. I liked stock clutch best for what we do.
I have 370 hours and 13000kms. We ride fast. Only blew one belt. Gates kevlar on last trip with stock worn out primary. Was hot day. 30c. Was running 100 kmh when she went boom.