I think I ocasionally miss a shift or two but nothing to often. The hesitation is probably jetting related. Find out what jetting You have and what possition the clip on your needle is set at and post them. You'll get lots of help. Good luck.
No and no. By shift sensitive, do you mean you get neutral when trying to shift from 1st to 2nd? If so, eliminate the obvious stuff first. Make sure the shifter isn't catching on anything, and maybe try a different tranny oil, eg 10w40 motor oil. Also, shift forcefully - give it a good stomp when going from 2nd to 1st.
The hesitation off idle sounds like a jetting issue. Have you had a look at the carb tuning article on the justkdx site?
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