I've no experience in modding - I'm planning to try UIB in my next career - but I've found that you can be in 1941 and still run up against the occasional (Elite?) super-corvette (more likely than a super-DD, since they change speed and heading more quickly).
I'm playing with the external cam enabled, and I use it, and I'm watching what those guys do. One firm, and rather sad, conclusion is that their sonar and hydrophone system isn't at all affected by depth-charge explosions. Your boat might be rocking from side to side from recent nearby detonations, but somehow the enemy can still pick up your faint propeller traces. In real life, you'd maybe use that window of sonar blindness to sprint in a different direction, hoping that the attacker would turn the other way. Not advisable in SH3.
Running under other ships doesn't seem to work either, unless the collision detection kicks in. IOW, they can hear you, but they don't want to bash into that coastal merchant that's in the way, so they change speed and course, which might look as if they've lost your trace.
As yet, I'm unsure about the baffles thing. Sometimes, you can do what you want when you're behind the DD/whatever, and you're not picked up. Other times, they can hear you pretty well, and will make course adjustments depending on your (flank) movements, even though you're behind them.
You can sometimes write your name with their wake by changing course and speed, even while the DCs are exploding and they're travelling quickly away from you. Starforce aside, that's the most annoying part of SH3 for me.
Then again, I'm still playing the game, so who am I to complain?
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