You can mitigate the blocking by using evasive manouvers (which you should do anyway rather than making yourself a sitting duck) and your targets will move into target position more often if you turn the sub. In the real war AA gunnery was used as a last ditch defense when you could not get away in time. More subs were sunk by aircraft (or with the assistance of aircraft) than any other means.
-Pv-
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