Several year ago, when I still had my Viper, I used to get challenged occasionally by sport bikes. They would walk away from me from a stop, but when speeds got serious I usually prevailed. A combination of horsepower, aerodynamics, and pucker factor usually had the bikes giving up the ghost when we passed the 150 mark. I'd bet I was considerably more comfortable in the Viper at 150+ than you were on the R3R. I saw a bit over 140 on a sport bike once, didn't really want to do that again.
Disclaimer: closed course, no animals harmed, don't try this at home, yada yada yada...