Looking at the F6 TDC map screen, there's something strange imo.
If you use the following settings for forward launch, the indicated torpedo track on the map (bearing overlay) is straight 0:
Bearing 0
Speed 0
AOB 0
But if you use the following settings for stern launch, the torpedo track is NOT 180 but about 5 degrees off:
Bearing 180
Speed 0
AOB 0
(Problem appears in GWX, don't know about stock)