If you have heavy seas it can set the influence off easier, so just set them to contact. Still, the way things are programmed you're gonna have lots of torp failures early war. Set them to influence, more prematures, set them to contact, more duds. Either way it's about the same percentage.
Shooting at slow speeds with some angle is supposed to help. You may want to carry some M10's, not as powerful, but work most the time.
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