Sounds like something blocking the main jet circuit or possibly lack of fuel entering the bowl.
Be sure you have good flow of fuel to the carb.
If the flow is good, take the carb back apart and go over everything again. If you have the instruction sheet follow it closely, especially the float level setting.
Knowing the basic theory of each circuit of fuel delivery helps. Might search the carb model under "images" and get a cut away view of how it works.
Doesn't sound like a vacuum leak. If it is a vacuum leak, it would be a very bad leak, you should hear it. The throttle bushing would have to be severely worn to cause this, not likely. The governor would have no effect on the mixture, just the engine speed in relation to throttle position.
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