I quite often use my aft tubes, both in the ways that TDK1044 & Chock describe but also I like to engage a convoy with bow tubes, dive underneath the convoy and once past engage again with aft tubes. This then leaves me with open water ahead to make my escape.
Must admit though that I've never managed to sink a persuing destroyer. Their senses seem too sharp so I now don't even bother trying to engage and save my ammo for merchants.
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