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at the age of 10 years, I'd suggest renewal of all consumables, including float valves, which you did not mention dealing with in your OP.
I employ specialized equipment to assure effective cleaning, kind of removes the human element from certain phases. Prior to completion, I also "wet test", among other things, working fuel levels for accuracy. A certain, long time established member reports his 250 performing impeccably (while delivering 67 MPG) after I did a pro "refurb" of his carbs....successfully done on 1 attempt.
There is much more involved ....but I think I'm adequately qualified to submit, with all due respect, you've missed some element(s) involved somewhere.
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