i agree turning the choke dial counterclockwise a little will pull it off a bit faster & not engage it as soon after shut off. another thing i found when you find the sweet spot for the dial, is to back off the fast idle adjuster screw a bit, if its set to high then it engages the steps on the cam more. some of the factory high idle rpm specs are a little too high IMO & when the weather changes it can make the choke stay on longer or at higher rpms than needed.
im in iowa & deal with this on my e-choke & manual choke cars every season, but have got the dial & flap adjustment in a pretty good spot, backing off the high idle screw about 1/2-1 full turn seems to fix the issue you describe. but im no carb expert, just saying what works for me.
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