It's fairly weird the damage system, Try adjusting the depth of your torpedoes and see if you can basically hit the keel of the ship, this will generally snap it in half. But yeah i know what you mean 60 ap rounds into the back of a ship *it was an armed merchant poor thing doesn't have guns facing its back* and a lot of them hit the prop and did no damage, also the fact I Hit a tanker with HE after HE Shell in its tank compartment and no big fireball.
It is also fairly wierd in the sense that i've gotten a 1 torpedo kill on a 16 k ton Ship, while it takes me like 2-3 torpedo's for a 7k ton merchant.
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