Hi man!
I'm far from been an expert by any means, but have you ever considered the fact that the behave like that because they spot you? Are you getting too close before diving?If spotted, the convoy will scattered and not following predictable routes. As far as DD, active sonar can and will detect you even standing still at periscope depth. Only thermal layer con conceal you.MOST OF THE TIMES, but not allways!
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