All task forces are mostly destroyers and other sub killers. There really is no logic in going after task forces as a result. They have the edge, and even if you do sink a destroyer, it doesn't help the war effort like sinking a merchant. And what's more, if you sink a destroyer, there will be three more hounding you and each one is capable of killing you.
If it is a troop ship, it will be traveling so fast that you have virtually no chance of setting up a shot, plus with the zigzag tactic, and your slow torpedoes, they can mostly out run your fish, or avoid them.
What the Germans should have created is a small sub with a small crew, capable of great depths, with a huge battery capacity capable of fast underwater speed, carrying a few reliable sound-seeking torpedoes. Attacking is one thing, but being able to get away afterward is the key to survival. Depth and speed are key and those are the two things subs lack.
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