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My two cents on the diagnostic. To add to the approach speed, evident turbulence and to all others valid explanations, there are two key points to take in consideration:
1) The drag originated by a propeller spinning at very low RPM (This is way bigger than the drag of a propeller completely stopped).
2) The "shadow" over the wings that a propeller spinning a very low RPM can cause, blocking the air flow which will translate directly to lost of lift/sustentation and faster stall.
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