I am with Sailor Steve here; an escort waiting since some merchants are sunk or damaged to start his survey shouldn't have made a great job.
Speaking of Aod, the surface attack in poor visibility becames the worst tactic after mid 1942 about as, thanks to radar, escorts are able to see in such conditions really better than you.
Some attempts are still possible by time but, in a general way, best to forget this method (really great early in the war).
Waiting in the deep is often the best thing to do, when your work isn't wasted by an unexpected course change of the convoy.
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