I think torp following in external cam hasn been disabled in this game. Watching the dev clip releases the past year I noticed they never used it but followed the torps manually. I also believe it's not a "bug" but a purposeful decision on their part.
As far as duds, the widely varying reports we see on the number and circumstances on the duds indicates the experience has a random factor as it should. One of the reasons it took nearly two years to fix it in the real world.
It is possible to get lucky and have an effective patrol even with the duds while anohter captain can't hit a thing. Even the Gudgeon which held the sinking record before being lost had a patrol where it sank nothing.
-Pv-
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