I wonder if you have an air leak somewhere in the carb. Your bike runs/idles fine when hot (something is expanding and sealing the leak) and when cold you need to choke and the idle is low when you throttle down.
Just for kicks, is the throttle slide spring indexed correctly at the top of the carb cap? I know that it can be a bit off the index and cause idle issues.
That's all I got.
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