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I suspect something in the carb! Idle is fine and the GAV, on mine is set at one turn out and left alone. Having the GAV that far open is a tip of something else that is being masked by turning the GAV 4 turns open. Gotta be a fuel issue in the Main jet path. Gotta be a main jet flow problem being masked by the opening of the GAV! If you can, get a carb kit for your carb and clean it all and get into the main jet hole feeds with a small wire and really clean it and let it soak. Use High air pressure to blow everything out and then clean it again!