Hi there
nice to see more video tutorials on tube
I like the style of attacking right from the middle of the convoy,
that's what the most succesful Uboat aces did and it's pretty much why they were the aces to begin with: you get a good chance to hit 5 ships in one attack.
usually you'll sink a few and cripple a few others, which you can then finish off later.
if you do it by day though, make sure the periscope stays down as much as possible, i was surprised it took them as long as it did to see your scope
and take evasive action
bosje