Hello
1. I think that you probably could have spent your torpedos better. When firing one try to have a small gyro-angle. When you're aiming on a ship there is a small triangle on your scope. Fire only when this is green as that way you have a good chance of hitting the target. Also try to hit the ships at different places to ensure flooding. Have a look at this tread
http://www.communitymanuals.com/shii...hip_Weak_Spots
2. I'm not sure but I think ramming doesn't give you credit for the kill.
3-4. I have no idea
5. It's a common problem with SH3. Neutral ships are in convoys but they still count as neutral. There is no way around that. If you kill them you get the tonnage but lose renown.
If you have any other questions PM me or ask and I'll do my best to reply.
Good Luck and Good Shooting