Sure sounds like fuel starvation to me.
I think Caleb is on the right direction. Old/dirty/water-contaminated fuel can cause all of these symptoms, and can also re-clog a freshly cleaned carb. You can eliminate that from the equation by temporarily using a portable fuel tank with fresh gas.
When you cleaned the carb, did you physically run a small stiff wire thru every opening? Carb cleaner isn't enough. You need to get a wire thru them. There are lots of strange and mysterious vents, jets, and passages inside the carb. It's easy to overlook one. And even a thin film of varnish on one of them can cause the engine to run terrible.
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@(^.^)@ Ed
1977 Pearson P-323 "Dolce Vita"
with rebuilt Atomic-4
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