There may be no long term solution for this
zinc/ethanol problem with these carbs other than replacing them with the newer aluminum version. Fuel flows mostly trough the main jet. Debris from whatever source once it makes it through the main jet can get stuck in the idle circuit, the idle transfer slots, or the discharge nozzle in the main venturi. Spraying carb cleaner down the air bleeds may push the debris out the idle transfer slots or back out the main jet and may end up just being a temporary fix. If the debris is pushed back into the fuel bowl you may get to experience this all over again and it may happen at an unfortunate time. Taking the carb off, removing the venturi, the idle screws, and the main jets, and then blowing out the entire circuits will remove all of the debris but then again the
zinc corrosion can continue and the cycle can start all over again.