Long Lance torpedoes were oxygen-fueled, so they could stuff more explosives in the warhead. USN (and KM and RN) used more conventional fuel.
Two hits to sink a ship is pretty normal, as a Kaleun I can vouch for it. But the 40% duds.... that shouldn't be happening in '44. Are your torpedomen idiots?
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The entire German garrison of Vanviken, right here in your thread! 
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