This one was pretty tense.
I caught a group of 4, went on their tail. As I was about to close in on the last one, the second FROM THE FRONT actually managed to detect me because I was JUUUUST not in the baffles. Instantly hit silent running and made for evasion. He came right for me, but lost me again, so resumed his original path, after which I now had him rather isolated from the others AND in front of me.
Not shown was me sinking him.
Also not shown was me getting hit by my own torpedo coming back at me because I somehow missed sending it straight away, so it looped back when the wire broke and hit me.
Then I went to pursue the other three, but apparently one of them actually waited for me and sent a torpedo my way, which activated right in front of me. Had I not done any evasion and just went straight, it would have missed me.
But 1968 is getting really frustrating, because I spend like 20 minutes (with time compression) just looking for dudes and then this kind of shit happens.