the 750 is going to be a bit faster because its lighter and has slightly higher peak hp in stock form (although not much). the rc has more tq which is nice so that you dont have to tap dance on the shifter to keep up momentum on the track (you can lope around in lower rpms and still get good drive out of the corners due to the tq. on the rc). while the rc's can run for high miles with great motors, that is high mileage especiallly for a track bike. id say sell your 750 and buy an rc with lower miles.
2004 RC51: akra slipons,soft-rev,depaired, deflapped, 126rwhp/72ft.lbs.tq (uncorrected)
Red Zone racing
CCS/LRRS/WERA Ex. #96
(currently on hiatus)
Moto Mummy,dyno-solutions, mavirykdesign, Ron Ayers Motorsports, Vesrah, carbonparts