As the war goes on finding lone ships becomes very scarce. Attacking a convoy in relatively shallow waters is a pretty difficult task, its much easier to evade the escorts when you can dive below 200m. Once you hear the depth charges drop the time lag gives you considerable time to manuever. Escorts will hit the throttle once they drop their charges allowing you to temporarily move around at flank speed with relative safety that you can't be detected (passively, active is always hard to evade in any scenario) and evade them (in shallow water).
Your only other alternative is to go harbor raiding, you'll always be in shallow water making it difficult or sometimes impossible to shake a DD overhead (usually have to wait for them to runout of charges (which can take hours in real time), get them to blow themselves up from not accelarating after dropping their charges (basically box them into a corner where you are close enough for them to go after you but too far away to get hit) or to sit and wait for the time that you can actually get a good shot lined up to sink them). Everyone here has their own opinions on harbor raids; though one aspect I think all would agree upon is that you have to really master shallow water maneuvering/tactics to become really successfull with harbor raids and come out alive.
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