There is a fix for the battery and torpedo problem. Look in the SHIII mods forum, select the mods list thread and scroll down, there sould be a mod for xxi battery fix.
The other problems I'm not sure on. You can reduce the Snorkel cross section by making sure you are at snokel depth when you deploy it. you can also trim the boat down a meter or two to reduce the projection of the snorkel, and do it at night, so it can't be seen
Best of luck
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