When I have a persistent DD on my tail, I normally change course so that I'm running 180 degrees opposite of the convoy's course. So if the convoys is heading 275, I run at 95.
I have found that even though the DD has you dead to rights, he still has to protect the convoy. So after a given distance, he turns tail to catch up with the convoy... even if he hasn't lost you as a contact.
For lone DD's, you're pretty much stuck until you can break ASDIC contact. If you can manage it, dive deep (deep = 150+ meters). If you're in shallow waters the best thing to do is to tun into the course of the DD to increase the closure rate while still at Ahead Slow. At +/- 500m distance go full/flank speed and change course to 90 degrees port/starboard and hold on. When he drops his DCs they should be well off your stern and you can change course and slowdown again. Rinse and repeat until ASDIC is broken.
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Give me an Army of West Point Graduates, and I'll win a battle... give me a handful of Texas Aggies, and I'll win a war!!
George S. Patton (1885 - 1945)
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