This mission is very simple.
In my opinion you should use your sub advantages above "enemy" disadvanteges.
For LA Fl III best advanteges are:
- very high tactical speed
- high maximum speed
- very good torpedoes (not usable in this scenario)
Enemy disadvantage was (in this case):
- high speed (too high for using effectively TA)
- using active sonar (easy for tracking)
Below video from my game:
Autocrew:
- only active intercept
Manual:
- TMA
- all rest
Btw I played this mission in original 688 H/K years ago