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The floats have enough buoyancy to force the needle closed and stop the flow of fuel. If the float and needle system is working properly fuel cannot leak from the overflow tube. It's a physical impossibility. That means there is still a problem with the float and needle assemblies.
If it were my bike this is what I would do next: I'd remove the carbs and remove the float bowls, leaving the floats in place. Then, over a bucket, I'd hook up an IV of mineral spirits (less flammable than gasoline, easier to handle) to the fuel inlet of the carbs and push up on the floats to see which needle is still flowing with the float raised. I would also see if either float had fluid in it, and see if they would sink or leak in a cup of mineral spirits.
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