Thanks

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I have had indeed incredible amount of luck on the campaign, to the point where it now feels way too easy

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One of the reason why Patrol 4 will be on a Salmon class, get those Mk14 duds in (having installed lotz_duds mod).
Re situational awareness - do you mean marking the contacts on the map (relative to your ship?).
That IMO is really the hardest part by far (the distance being really the killer) - and since this was my return to SH4 after years, the bit I don't do at the moment. I still need to brush up on that, and when I take up another campaign, I'll do that, as a challenge.
Something (lite) on UK doctrine can be found in Tim Clayton's Sea Wolves.