I wish you were able to talk to someone smarter than me, but I don't think you're having a jetting issue.
That jetting was off - but now that you have the jetting set in the normal range, the "lack of punch" and hard starting sound like something else.
I had an experience once where my bike would only start one attempt out of nine, and wouldn't run right when it did - the problem ended up being the reeds. They were worn/cracked.
I wish you had a CDI to swap in and make sure that wasn't going bad (although I might be fishing for answers there).
Thirdly - I don't think this is the problem, but given the weird jetting and not knowing the bike's past - it's probably time to repack the silencer. I was loosing power and didn't know why...thought it might be an air leak or some other odd problem...somewhat embarrassingly, my spark arrestor screen was clogged and when I cleaned it I got my old bike back!
I suggest checking the reeds and going from there.
Jeff
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'18 GG XC 300
'05 GG DE 300
'01 GG txt 321
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