You wrote you were at "all stop" waiting for the convoy.
That might have floated your boat's tower top above the surface, even if just for one or two centimeters. And that is a dead giveaway.
Another thing - you waited at 90deg offset. Try doing that at a heading the same as the convoy so you dont give a hughe ass profile to the destroyers in the convoy. Then as the destroyers in the front of the convoy passes you you knot up to 2kts and maneuvre into attack heading.
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