I've only tried to adjust the spread angle after I've already fired two or three torpedos and they've all passed behind the ship I'm firing at. I also thought I might have forgotten to open the tubes, but there are times I'm positive that I remembered to do it and it didn't seem too make any difference. One thing I did came to think about though was that I think all of the ship encounters when this has happened took place in the daytime. It's possible they simply saw my torpedoes and increased speed or something even if they didn't seem to react otherwise. They all kept going in a straight line basically
