1. Best thing to do is to watch own torpedoes. Launched with 5 kts lower than attack speed they increase speed when detect something. If torpedo begins to slow down and making turns - it means target wasn't sub/surf but decoy. In this place make mark on map (enter)
Preenable it and change course when you suspect real target go. Enable torpedo in some distance from decoy.
2. Because it would be hard to simulate in DW, wire guided torpedo haven't wire limitation.
Opening tube causes additional noise and affect your hull/spherical sonar
3. Definitely torpedoes - they are much harder to avoid/destroy by surf.
But if you use RA mod, and play Akula II or III, Sizzlers (supersonic) are best anti-ship missiles in game - very hard for shooting down and they allows you to plot waypoints.
Check my YT channel - i have many videos from MP sessions and single player game: you can learn how to play
Link
