Engines off might actually be the problem. If you're deep enough to be under the thermal layer (are you?), the best tactic is to keep moving slowly away from the last position where the DD's think they detected you. They might just be pounding the last spot where they saw a torpedo launch, or whatever you did to attract their attention, and you just haven't moved far enough away from that zone. They'll fixate on "last contact" and poke around in that area, if they don't have a fresh contact.
Even with fairly aggressive mods like RFB and (especially) TMO, I can usually creep away on silent running and ahead slow. The places where I get nailed are usually shallow water where I can't get deep enough to be under the thermal layer.
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