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KEY QUESTION: Am I safe in assuming the stock "cuff" of 19 deg for 11" is designed to hold smooth flow? (diagram 1)
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I'd say no.
Especially when you consider crosswind conditions. Do the math, but a 55MPH wind at 90 degrees would be 45 degrees. A 10MPH wind at what sail boaters call a 'close-hauled' condition would involve trigonometry. Separation on the leeward side.
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Windward and leeward
In geography and seamanship, windward and leeward are directions relative to the wind. Windward is upwind from the point of reference, i.e., towards the direction from which the wind is coming; leeward is downwind from the point of reference, i.e., along the direction towards which the wind is going. The side of a ship that is towards the leeward is its "lee side". Wikipedia
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