Well, do you think they would have implemented a constant into theTorpedokommandogeraet to compensate the seconds it takes a torpedo to fall downfrom 50 meters and start the motor?
The pilots tried to match the ideal conditions (height, speed and distance) to drop the torpedos. Of course we all know the reliability of our data gets worse with increasing distance to target. Why do you assume the lufttorpedos had to turn in the water? It's far easier to turn the aircraft itself. Maybe the torpedos didn' t even have a gyro compass to steer straight.
For distance and collision course...
... get a targetsolution from your WEP and switch to manual TDC in SH3.Zoom out and observe the reaction of your torpedo path when changing the distance -even extremely.
Distance is irrelevant for constant AOA, AOB and target speed.
Resistance is futile!
Edit: why do I have those missing gaps between some words in my postings? In this case distance is relevant I think.