Your description gives every symptom of a malfunctioning accelerator pump. As I recall, there are check balls in that circuit. You can look down 9nto the throat of the carb even with the engine off and see if there is a small spray of fuel when you open the throttle. If not, you found the problem. Also, look into the float level. A restricted needle and seat can cause a lean condition that will cause hesitations. Float level too low or a buildup of junk in the bottom of the float chamber can also induce a lean condition.
Everything you stated points to a fuel problem. Not ignition.
Things like a bad condenser will affect the entire operating range. Distributor bushings will cause the timing to vary over the whole range of operating RPMs. Resistor will only affect starting - not running.
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