I think that real U-Boot commanders usually launched more than one torpedo (at least in case of valuable targets), due to the possibility of duds and misses. My personal rule is: always two torpedoes except for 2000 t merchants.
Radio messages add a lot to immersion even though some of them are not directly useful to the patrol, so I always read them. At the beginning of war, for instance, you will be able to read about the always changing rules of engagements.
I too advice you to try GWX instead of the Med Add-on you have.
Cheers
Maraz
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First career: VIIB U-54
Current career (Black Sea): IID U-24
GWX 2.1, U-Jagd Tools, 100% difficulty, manual targeting, DiD,
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