Take the carb completely off the engine. Pulling the top off and "spraying out" isn't going to help. You need to disassemble the whole carb. There is something blocking the fuel passage.
Sea Foam is a great product. It works. But it only can do so much. It doesn't eat dirt out of the carb like acid, it's just a fuel system cleaner. Does a lot more for carbon than anything. From the issues your having I'd suggest cleaning the fuel tank too.
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