May want to be careful using U.S. sub operations as a reference for Atlantic u-boat action.
Two completely different doctrines and equipment in two completely different theaters with different tactics, etc.
The German acoustic torpedoes were (mainly) to use against convoy escorts. While games allow it (along with ahistorical night periscope attacks), firing torpedoes via hydrophone use was not an sop for the Germans until the Type XXI came about................which was never used in combat.
Fwiw.
