what i do is set impact trigger, set the depth to minimum (or leave at default), shoot a salvo, and hope for the best. you can also guesstimate the draft just by looking at the ship, a big ship will have more draft, and a small ship will have less.
i find that you can waste two or three torpedoes going for that one hit kill trick shot, or you can shoot those two or three torpedoes in a way that are guaranteed to hit and sink the ship, or damage it badly.
miss your trick shot, now you have to reintercept, waste fuel, plot another fire solution, and you won't always have that opportunity.
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