My 2 cents: When attacking convoys i always go for the biggest priority or the biggest ship, usually these are tankers or passenger ships. I dont really bother with the small ones because you can find those away from convoys and attack rather easily.
I set up for a 90 degree shot but i go to a depth of around 230 or 250 depending on depth capability/hull integrity and so on. I creap into the convoy on silent running and battle stations and listen for the destroyers on my hydraphone to hear when they have passed overhead, then i go to periscope depth, quickly pick out my target with perisope ahead and behind me, always set up your torps before hand to depth and speed. Then i fire at the farthest ship away then closest if possible, hit 250 depth and run in opposite direction of the convoy to get away from the destroyers. If i survive the depth charges, i surface and depending on how my fuel is and amount of torps i have i will make an end around to try my luck again.
Just so you know an end around is sort of like this. Imagine a 4 lane highway and the convoy is on the far right lane, you want to get over in the far left lane and pass them by a long safe distance then cut over 90 degrees and set up for the attack. Good lluck to you mate.
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