Yes to all above!
Reeds aren't the problem.
Get the head clearances and compression setup.
Get the float level in the carb nailed.
Get the jetting specs ball park, and then dialled.
I set my idles quite low so they tend to not idle very long in gear with clutch pulled. The drag pulls it down. In neutral she idles as long as I want.
Been like that on my last 3 engines - 2010, 2012, and 2018. I chased the 2010 around in circles for a long time. 2.8mm of squish clearance made the engine behave very inconsistently.
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