The periscope depth for the XXI is deeper than for the other boats. 16m VS 13m. In rougher seas, I'll usually set the depth manually to 14m so that I can get good lock-ons. The only caveat is that this makes it quite visible to opponents, so it's best done when you are already detected (as in your situation). And use homing torpedos and decoys when you face destroyers.
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