another good test would be double-blind rectification – giving dates but not birth hours of known AA charts and seeing how well astrologers do at getting the right answer when they rectify the chart
i suspect they will do very poorly – podcast people here doing research are very annoyed to hear of people polluting datasets with rectified charts, accusing the people who add them of Lying, which implies that they have a low opinion of rectification as it is practiced
whether this means astrologers are generally bad at rectification or whether rectification doesn’t work or whether astrology doesn’t work are three separate hypotheses, but this one seems more testable than most