Touring tires aren't a real good choice for a sport bike. Even my FZ8, which really is a kind of sport bike, hated the PR3's and Roadsmart II's. Front end would shake at about 110 mph, not good. They stuck reasonably well but didn't provide much feedback and the ride was so-so. Switched to Q3's, shake was completely gone, grip fantastic, road feel fantastic. I'll never use a touring tire on a sport-oriented bike again.
I like the Q3's which work very well on the street and are a very good track day tire as well.
The construction of the tire is matched to the mission. Everything about the PR4, RSIII, and so one is designed to support a lot of weight over long, long rides at moderately high speeds. Those tires need a lot of weight to work correctly and even when they do they don't feel like a sportbike tire.
Some guys just cannot notice differences in tires and just want to go for the mileage. I tried this "mileage" approach and it took all the fun out of the ride.