I'm confused on how this applies to the original post. He is saying the RPM is shooting up without the bikes speeding increasing accordingly. You are describing the acceleration flattening out and the bike NOT revving up quickly.You may be feeling the difference in the fat, thick midrange power (for a 300) and where it tapers off as the revs hit about 10k or so? It's odd to be short shifting a 300cc Ninja but I find myself staying below 8k all the time. I can ride it all day long between 4k and 7k.
Revving it out brings more noise and not alot of additional accelleration.