One other thing you might want to try, and it's if you're up to it, is to take out the DDs using your rear tube (if you have a sub with one). The DDs will often times after passing over you will circle around to make another pass. Track them and as soon as they are right at 180 degrees in your periscope you let em have it. One time in one convoy I sunk 3 DDs this way before moving on to the convoy it self.
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