I have also noticed that it is taking a ridiculously large amount of torps to sink most merchant ships (in comparison to sh3). I turned off duds so I could test out the game. Convoys seemed pretty easy to find, but I end up using all my torps just to sink 4-5 ships.(I had to finish some of those off with the deck gun) This happened on all 3 partrols that I have done so far. It's not just that they are slow to sink, they are not sinking at all, even with a hole the size of a truck in their side.
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