My advice is the take Mark 10 torpedoes. Set them really shallow. That's about all you need if you like harbour runs. Maneuver around the search patters of any dd's, but be reader to try and kill them if they spot you. Saving or reloading a few torpedoes before heading back out to sea will help in case of dd's.
Those Mark 14's are a 'pita'. They run too deep, explode prematurely... or not at all.
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