Any tips on convoy attack?

[torpedobait]

I run at about 80% - I don't use manual torpedo targeting or event camera. i do use external camera occasionally because it looks so cool out there. I love to watch them sink! Oh, and although it doesn't affect the realism factor, I set the water opacity (?) to 20 so I can see better underwater. I know it's a "cheat" of sorts, but I'm in it for the fun, too.

You can close on cripple with a few periscope sightings and attention to your course and speed. The idea is to get there before the escorts start pounding on you. As for explosions, you are absolutely correct. My new way of getting around that is to go beside and beneath the merchant, only rising to periscope depth when I see it start going down. There isn't much of a window there so I doubt I'm going to be as effective. It's better to follow a Live ship when they come after you. No explosions to worry about.