Get your AOB sorted and in 1939 get as close as possible. If they weather is good enough, set the torpedo depth at ~1m below the keel depth of your target and use a magnetic pistol. You AOB then won't matter quite so much, but you may still get misses and duds that early in the war.
I now ususally only use magnetics when the AOB can't be fixed by manouver and find it quite effective on DD's in attack runs at short (<500m) ranges.
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