Both of the super mods shy away from anything that makes your u-boat more effective.
Seems all they want to do is add in new ways of making you sink faster, miss more, do less damage, die faster, take more damage, find things harder, travel slower, be less efficent. heh
It's pretty easy to give yourself more ammo, and to lower the reload times. There is a setting for more damage as well, but you should read
this thread for a discussion about it. The basic idea was that if you're going to up the damage, you might as well just not use the mod in the first place. That thread does shows how to adjust the ammo though, for GW at least.
I really don't know if more torpedos is even an option? Perhaps in the sea files, but I think that might break more than it would help.