With the engine at operating temperarure, the choke butterfly shoud be completely open. With a completely cold engine, the choke should be completely closed. Be sure your choke heat tube is not obstructed. The main thing is that the car should start good when cold and not be running rich due to choke when warmed up.
I've never adjusted the idle mixture as you did. I turn the screws in until the engine speed start to drop off, then open slightly. Don't understand why you would stop opening the screws when the idle speed started in increase.(?)
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