[Capt. Shark Bait]

dunno if this'll help, but... with a 5deg or greater spread at long range on a convoy, i'ld think you'ld have a great chance of hitting something, so long as you have a good solution, as opposed to close range. if you're less than 1km to said convoy you might be better off with less than a 2deg spread on a single ship depending on its size. a BB you'ld of course need all 4, but a tanker 2 should do it with less a 2deg. 5deg or more that close there's a good chance you'll miss with most of your torpedoes, but you might get one hit