[Corsair]

I like to get the "real" feeling, so it is 100%, manual targeting. No map contact updates. Dead is dead. Manual navigation (no sub on the map) and no use of the waypoint tool. Never man the deck or AA guns myself.
No external views ( I tried to leave it on only to take screenshots, but found out that in tricky situations I couldn't resist to have a quick look at where the damn Black Swan is... and anyway I already have hundreds of screenshots...lol ). Forcing you to no external view in my opinion is one of the greatest enhancers of "real feeling"
For crew fatigue I use the mod model I am playing. (with NYGM I usually rotate every 12 hours on patrol and every 4 hours in combat situations) TC limit 128 in enemy zones. All attacks at real time from spotting. Radio msg to Bdu every day around midnight together with the night shift of crew.
If I need to reload external torpedoes, I head to the coast and find a sheltered cove where I "anchor" for the duration of the operation.