It could be that they can't spot torpedo wakes? Or maybe it depends on lighting conditions and crew quality? If they don't know where you fired from "guessing" might be hard and they'll just look around where they happen to be. I do agree that the behavior I've seen from some escorts (and I probably haven't had as many missions as most folks here so WMMV) does seem to be them deliberately slowing down or even stopping to listen. That doesn't explain why the merchants they're guarding also slow down and sit around. I'm trying to remember what I've read about IJN convoy tactics and it seems that they usually try to run for it leaving one or two escorts behind to pin the sub down and rescue survivors.
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