I think that you may be right on the edge of standard or heavy. I am 20# lighter and passenger 15# lighter and have the standard on my RKC and with both of us without luggage use about 3 to 4 turns preload,and use 2 turns preload solo. giving me a lot of room to go up or down on the preload. I would go with the heavy.
JMS in TX
JMS in TX