Prevention is better than cure...
Don't close the convoy, but launch your torpedoes from at least 3500 metres...4500 is even better. Immediately turn away, set depth for the maximum you dare, but stick to 1 or 2 knots. You are so far away from the escorts that you are stern on to almost all of them, if you see what I mean. And they cant hear you at all.
I'm doing this in Wolves at War, in the Mediterranean in summer 1943, against NYGM 3.0 'bloodhound' escorts. In six attacks ( including one against a cruiser task force ), I haven't even been detected, let alone depthcharged. Try it; you will be surprised at what you see!
You need to make sure your firing solution is spot on at that range, and of course FATs will have no fuel to run further if they miss.
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