I haven't played this one myself, but it sounds like you need to make those four foward 14s count by at least slowing or stopping it so you can effectively use the other torps. Got to hit a vital spot with all four 14s set to keel hits. I would go for the stern and try to kill the propulsion and/or steering. It's sister flattop was killed with an engine room hit at the water line in the real war.
-Pv-
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