Here is the original "find" KM, from back in June of 2023:
FotRSU Post 5525
So jimimadrid's torpedo mod works fine in SH4 and most other mods, but FotRSU has several files that have different IDs for some equipment. There-in lies the rub. With his torpedo mod in FotRSU, the ID actually calls the G7a torpedo for Tubes 1-4, like you are driving a Type VIIC... Leave the torpedo files out of the crew management mod, and the base jimimadrid files already in FotRSU will do appropriate calls, since we edited the ID numbers.