To the question of destroyers escorting convoys camping it just didn't happen. Escorts were too few and far between to waste even one in an extended search. With the U-Boats using Wolfpack tactics an escort staying behind to wait it out that would leave a large part of the convoy unprotected. The objective of the escorts was to drive the U-boat down and keep him down until the covoy was out of range of an attack.
Later on, when escorts were more plentiful (ie after the US entered the war and started taking the U-Boat threat seriously), there were Hunter/Killer groups assigned to the convoys whose job was to hang back and, once the regular escorts detected a Sub, charge in and stay with it until they killed them. But that was later... late 43 onwards. Until then escorts were too scarce to waste chasing down shadows.
JCC
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