Good point. After sneaking in on my first approach with decks awash to 2000 yards or so, I fire undetected but immediately surface, turn tail and run at high speed. Ususally that results in the escorts doing a pretty perfunctory job of giving half-hearted chase while I get away to end around to the other side of the convoy.
So shoot, helm hard over while the torps are on the way to target. When the boom happens, surface and turn tail at high speed. That's the program on this boat. A boom is a detection and decks awash ceases to be an advantage.
