[ppk]

Haven't fought much in late war recently save for a few single missions but here's an idea. Something I often do to the determine the course of a convoy is to get ahead of it and note down the relative bearing at which columns appear to line up. Good weather is a prerequisite, but you could try long range keel shots straight at a column with magnetic detonators. No need for a solution, the challenge becomes to visually line up the smoke stacks. Fire a narrow spread and you have a solid chance to hit even with straight running torps. Might not be the best solution but it doesn't seem completely stupid to me either.