I'm not enough of a mathematical wizard to tell from those values, but would it be possible that some of the attacks that are described in books and war diaries actually were calculated to achieve a 90 degree contact when the torpedo hit the ship - after the torpedo's gyro changed its initial heading?
I have played SH3 for a long time, intermittently though, and to me the fact that you can set the launch in a way that ends up in a 90 degree pistol - keel contact, even though the u-boat's course is far from perpendicular, is still new and hard to grasp.
Here's a link to those of you who like me are in the learning process in this kind of torpedo firing:
http://helmut.saueregger.at/gamereso...h%20Attack.pdf