If you feel like they deffinetely have a lock on you, go to flank speed, wait until you actually reach flank speed, switch to silent running and immidiately innitiate a course/depth change, that might throw them off for a while.
One more thing you might try is not to dive at all. My stantard tactic is to attack at night on the surface. Shoot the torpedoes at 1500-2000 m, turn around immidiately, shoot the rear tubes and run away on the surface. At night the escorts cannot see very far, usually I'm out of sight before they start their light show. Depending on the type of your boat and the sea state you can even outrun some of the slower escorts on the surface.
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