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Sounds like your narrowing it down.
I had another thought... The previous owner may have installed one of those K&N "open" type air filters at some point.
That would include up jetting so a close look at the main jet could only help.
Try to verify the OEM main jet size. I do believe it is 102 but i'm not 100% on that.
Oh yeah, The auto choke.
It might be working partially. You mentioned that it does idle down but those chokes are notorious for working part way, and not sealing completely.
They are supposed to move a full 5mm when plugged in, and the key is first turned on. This generally takes about 30-45 seconds. Depending on the stator used these can run on AC (20-30 volts) or DC @ 12 volts.
My best advice is to get a new choke from Ebay or similar. They run about 5 bucks shipped. This way there is little doubt, and a spare IF yours was working.
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