Run default settings mostly from roughly 90 degrees AOB (75-125); rarely duds, whether impact or impact/mag. Usually requires a few hits compared to one or two decent deep/keel hits, but a hit or two on default usually slows them down and allows one to move on to other targets [and then come back and finish it off]. This is with US Mark 14 fish. German eels are better (T I); they tend to work deep and detonate under ships, and this allows for shots from all angles.
Run a few meters deeper in big swell for both sides (impact for Mark 14s); the dud rate goes up, as does the miss rate, but that's to be expected.
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