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OK, well it sounds like your high speed jet is partially plugged, or perhaps needs cleaning. Did you remove the high speed jet from the nozzle to inspect it? The slightest debris or perhaps a little dirt can affect it. Try pulling the choke out slightly while the engine is bogging down, you probably have a carb issue if the engine seems to pick up with the choke partially closed.
But, like you say, perhaps you have a fuel supply issue. Why do you suspect a primer bulb issue? Do you have the tank vent open? Perhaps try again with the fuel tank cap loose. Pump the primer bulb while the engine is “bogging down”, if it picks up then you have a fuel supply issue.
All that being said, you could have an ignition issue, but I’m guessing it is a fuel issue based on your reports. Feel free to post a video of the engine running/bogging down if that will help.