It wouldn't surprise me if you pulled the float bowl and found the main jet laying loose in the bottom. I've had those same symptoms, and found that result, before. At lower throttle setting where the needle is controlling the mixture, it'll still work with no main jet, but as the taper of the needle comes into play, so does the main jet, and if it's (the MJ) just a big wide open hole, you're gonna act like it's flooding out (because it is).
Just another quick, easy-to-check (through the float bowl drain plug) possibility.
Tim H
multi-time victim of Murphy's Law
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