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I've been making tests with this:
- O.H. Perry in ENCOM at 10 knots closing to an Akula2 (me) running at 5 knots.
- Seastate 2
- Surface duct, very deep water
- April, mid Atlantic (30N), clear weather
- LwAmi mod v3.08
- SONAR autocrew
- Created a trigger that tells me when I'm detected by the Perry.
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- seems that you're right about ownship's detection capability and shadow zones. But I allways thought that if you're in a shadow zone and you can't detect a ship, the ship can't detect you... but my tests doesn't support this... 
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If you are using sonar autocrew, you cannot say with any confidence that you were in the shadow zone but were counterdetected anyway. In all likelihood, you were NOT in the shadow zone and you both could have detected each other.
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- Some players, like Dr.Sid, have stated that approaching just bellow the layer is a very good tactic, even better than doing it deep... but again my tests says that going deeper is better.
I have to test this with suonobuoys under and above the layer, but seems that against a surface ship in deep waters is better going as deep as you can...
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There are no 'good tactics' in the abstract. Tactics are goal-dependent. If holding a track is more important that avoiding counterdetection, then deeper is better. If avoiding counterdetection is more important than holding a track, than shallower is better.
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EDIT: OK, I've made a new test with conditions changed a bit:
- Instead of my sub being the one detected by the Perry, I set up a line of 12 Akula2 AI subs at 5 knots a different depths and triggers that tell me when a sub is detected by the Perry.
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...a much better method of testing.
