Helps to be close, but not too close. You learn to time with the deckgun if waters are rough. A trick that seems to work is adjust direction, often going a different direction the boat will ride smooth. I've never tested why, running with or against the wind, doubt it, but it works.
Try running decks awash. You may lose your deckgun crew, but you can still use the 40's. If you see a escort coming, dive for a minute and haul arse. Once they lose you on radar they'll usually go looking elsewhere or the spot you dived.
The main thing is situational control, don't get so engrossed in shooting use lose the tactical advantage. If you have contacts on, keep an eye on that map, if not use sonar for nearest warship, but don't trust it, keep moving and weaving and be ready to dive. With radar boats keep moving, if you don't have time to sink merchants, set em on fire so you can spot them later.
If an escort is coming, turn on him and damage or sink him. Usually only one or two at best come looking. Most these convoys have smaller Type AB escorts, they sink or damage fairly fast.
Play with it, you'll figure it out, really almost too easy.
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