Mine used to have a hesitation, sometimes hiccupped, when twisting to full throttle - but only occasionally. I did 2 things that made a Noticeably big difference, so I'm not sure which made the bigger impact.
I switched plugs to NGK Iridiums (DCPR9EIX) from some basically Brand new HD OEM plugs.
And I did the Breather Re-route w/ Pics.
Maybe one or both of those will help. Also, I guess you're already you're running high octane gas.