FD, others will have more experience than I but I'm wondering if yours is a CA bike the emissions will be set leaner than normal?
I know it's the norm for CA vehicles to have tighter emissions. So firstly is this a CA bike?
I also note it is low mileage and it's probably running E10 gas. This will be a recipe for a fuel system that needs a good clean, I would suggest Seafoam on your side of the pond. It'll be readily available, mix as per the instructions for two or three tanks of fuel and see if it cures the fault. The torque should be fairly linear from what the charts show.
My concern if you did go down the route you are thinking is will it pass your CA yearly inspection? I can imagine they will be strict on emissions.
Good luck.
Upt'North.