Some are just pigheaded in the automatic choke department to where you just gotta let it sit there and idle long enough for the choke to start closing off and then you can slowly start feathering into the gas until its fully warm. Have seen this many, many times.
When valve adjustment helps the idle its because the valve seats have sunk a little which takes out any lash. You see this mostly on newer machines. Eventually the seats sink as much as they are going to go and your adjustment remains good. I do mine .003-.004 on both cause I like a quiet engine but some recommend more on the intake side. From your description I think you have a pigheaded choke situation.
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