I run the 350f at 2k ~ 5k around town, but anywhere else, I'm between 6.5k and 10k.
The bike loves being over 6.5k. It was designed to run and make power at these speeds.
You are cheeting it of its potential if you never hit 6.5k+
The 750 is 3k-5k around town, and 9k+ when I'm goosing it.
Lemme tell you, 3rd gear at 8.5k is a beautiful thing. Everything get's smooth and precise, everything sounds beautiful. It's not struggling, it's not straining, it actually runs best RIGHT THERE at 8.5.
Yesterday, I was between 7k and 9k for pretty much 2 hours. Never hiccupped, and was smooth as butter. 750 is built for those rev ranges. Don''t abuse your poor bike by never letting it run at it's optimal speeds.