Yeah, probably just not giving it enough time once it's warmed up. I think it takes a little longer than it seems, and like Talon said, every time the fan kicks on it's not counting that space of time as "idle".
Not to worry man, either you'll get it nailed down, or it will figure itself out after a while.
Also, the hesitation may just mean that you need to tweak the throttle cable a bit.
No worries man, it'll get sorted. I have the same problem when working on my car; every little thing comes with 2 or 3 other little things that need to get figured out. Pretty soon they add up to a big thing and I'm standing there swearing and wondering how in the hell I got in to this mess!
Hang in there!
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