I feel the reason most run 2-5 is so they dont worry about an accidental 1-n shift and they can just upshift till theres no more gears. dont have to stop at fourth. also if he already has figured out the max gear he can pull why wouldnt he want to make some small clutch adjustments rather than changing the whole setup. If you go with a plus 10 you will need new shock spring and valving, chain,and tires for sure. What you need to do is realize that you really have no idea about your clutch tune or how to tune it. look into different material and weight balls. Get a sping tester and set up some different base pressure sets get a cover you can acces your clutch easily with. and read slowerthanyous clutch tuning thread a couple times and go apply your knowledge.you have the ability to go faster with what you already have. also fyi an 8 paddle might not wheelie and might let you pull more mph on the topend. ive even seen it done with 7 paddles at smn