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As was said lots of possible reasons. Another is that going up wind the main helps balance the rig by adding force aft of the center of effort to the overall vector of forces. Could be they we trying to eliminate excessive lee helm but it depends on the boat. After all if they were right on the wind and making five kts in a 13 kt wind they'd have an apparent wind of around 18 kts which might be where they want to reef . Just a thought
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