hi.
with my somehow limited knowledge, thinking about three more or less possible reasons -
carbs might be out of sync.
diaphragm movement/condition issues.
slide/body mating areas might be leaking some air (due to wear), taking some fuel as well.
also, not sure what you mean by "control screw" - idle screw (on the cable attachment) or idle mixture screw (in front of the fuel bowl, harder to access)?
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