In SS2, I played with historical torpedoes at the very start of the war. In a training I fired my entire stock of torps and still the merchie refused to sink. Early on you'll have to rely more on your deck gun than those faulty Mk 14's.
But these are the things that were wrong with them:
-They would go too deep. I set them as shallow as possible.
-The magnetic exploder will explode too early or not at all. Use the contact exploder.
-If you hit with the contact exploder on a perpendicular (90 degree) angle, then it will most likely dud. Try for a 45 degree hit.
-Run them on slow speed!
I hope that helps. I've always hated the historical torpedoes, but now I'm using that factor to enhance my gameplay.
P.S. Get the Narwhal mod, those two 6" guns are alot of fun!
