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@Airhead
Mixture? Float bowl height can affect it. When you have an engine that's happier on the choke it's sign that it could be running a bit lean. If you have a mixture screw try that and see if you get better tune. Of course air filter condition (flow rate) and a few other factors contribute as you already mentioned valve height is important.
I had similar issues with the BMW for a while. Checking and adjusting the timing / float bowl height / mixture for 3 months sorted it, there's a big difference between hot and cold and no electronics to compensate so it takes a bit longer + mines a twin and carb synchronisation comes into it.