If you're using OLCE2, then the best approach is a surfaced night attack. The difference is perceptible - unless you're really foolish, a surface attack in the wee hours is usually devastating.
I agree that people here far too often confuse hard with realistic. My biggest problem was always with air attacks - I know that things were rough later on in the war, but is it really likely that in 1941 my boat can be attacked from Malta 16, 17 times a day, or regularly every half hour? As I recall, the RAF were so desperate around this time they were sending Blenheims up against the Luftwaffe and Italian bombing raids. That's not realistic - that's a pain in the arse.
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