I have noticed this on my '22 650 too. It is subtle, no misfire or vibes , but it feels just like the "choke " is on.You ask for 80% throttle and it gives you 40%. One pass through the box or even just through second and to third and it is gone.
We had mention of this but with a cold engine. I think it is to do with the secondary throttle valves ( stv) controlled by the ecu not opening fully.
It doesn,t feel like a fuelcut problem, where it gives you nothing it still gives some , but not what is expected.
I think it is masked somewhat by our natural tendency , especially with a cold engine or cold tyres when the engine is still warm , not to goose it
I don't worry about it too much, I don,t think it is a "fault " as such just a hiccup in the ecu map.