I don't see much difference between 1 and 5. Other than that the crashdive implies haste. I wouldn't choose to make extra noise or more bowspray in this circumstance, so I opted for option 5 (using the action description in the original post). With planes in the air you are not safe at periscope depth either. But as soon as I notice that the enemy responds to my presence I'll go for crashdive. Eitherway, I only attack when I can dictate the situation, not when I have my pants down.
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