Well at any given RPM, a smaller choke will mean a higher velocity air stream to carry the fuel, so it will help everywhere to an extent.
One thing you should check, and this will seem weird at first is the manifold you are running. And more specifically the temperature of that manifold. A manifold must be a proper temperature to keep the fuel from pooling inside of it. Now this is a secondary effect for sure, but having an engine at proper temperature is vital. Manufacturers go through great lenghts to ensure the manifold is up to temp quickly for this reason. What temp thermostat are you running? I recommend a 180-190.
Probably not your cause, but manifold temperature is not insignificant.