One thing you haven't talked about is the pilot jet. Fine and dandy on the main jet but your pilot jet handles most of your low gas pedal operations.
I have cleaned a TON of carbs. It is very rare for these things to have a float problem other than them being gummed up on occasion. It is very rare for them to have an electrical problem other than a broke part on occasion and when they go, it is very obvious (i.e. no spark or not charging).
Pilot jets can be a PITA if they are super clogged. I have broke off cleaning stems in them on occasion. If you can't get something fine enough through it, submerge it in carb cleaner and let it sit for a while until you get it cleaned. Compressed air is your friend.
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