No real special historical tactics proven to work, since the boat never really saw combat. However you can apply the same tactics you use with a Typ IX or VII. Now you have a significant advantage in speed and more endurance. Since the escorts can only ping and hear you if they themselves go slower than 10-12 knots you can outrun them under water and change course, since they will lose you quite easily.
However there's one thing I'd like to know myself:
The Typ XXI in reality had special silent motors that gave the Typ XXI a silent running speed of 4-5 knots. The DDs in GWX however can detect you if you're going faster than 2 knots in any boat. So: how fast can I go in a Typ XXI in GWX without the escorts hearing me? 2 knots or 4 knots?
Thanks
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