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A couple of thoughts. I've had the exact conditions that you describe, and I adjusted the float to be right on the money per Les Andrews book, but it still stalled. Turned out I had a pinhole sized leak in the float. New float, no more stalling.
On another Model A, I had the float set correctly and the GAV fully closed, and it still seemed to be running rich. I was able to fix that one temporarily by advancing the timing a little. No more stalling, but I still need to check that GAV and see if it needs some work.