I used to ride a Yamaha Virago 750cc for 6 years and recently bought a 2007 Honda 919. My handle grips are much smaller and I don't seem to use the throttle as smoothly as I did on my Virago. The Honda bars have risers and I'm 6ft tall. Even though I don't grip the handle too hard, I still have trouble having a smooth ride.
Besides practicing, are there any other recommendations?
This is only my second motorcycle.
Just like the previous post said, get rid of the excess throttle cable slack.
919s are notorious for it from the factory, and it really makes a difference.
You will see three things about Power Commanders on this site about what you have described.
I don't have that problem and my bike is stock (sometimes with slipons)
A power commander with a different map solved my problem (sometimes and sometimes not resetting the TPS through the Power Commander with your home computer)
There is clearly variance from bike to bike.
Likely the actual TPS position.
Altitude could be a factor.
Riding pattern is also a factor.
Stop and go in 1st gear is the worst.
Personally, my situation was C.
Stock, mine was a nightmare crawling in 1st in traffic on hot days especially.
Now I can walk it down well below 1000 RPM, no clutch at all, and throttle up or down with nary a balk.
Unlike before when it was in bucking broncho mode and drove me nuts.
And the mush front springs make it worse if yours is a bucker by nature.