Thanks for answers, I'll add that date is mid May 1940, convoy speed is 7 knots and I'm playing stock SH3 v.1.4b, no mods whatsoever.
Realistically I should attack both big tankers, escape and make another attack. But after 9 months of patrolling without convoys I AM greedy, extremely greedy and impatient, I would like to do everything in one extreme attack
The only thing that is worrying me is that corvette, so small, I don't know how to sink her. Since it's 1940 and stock merchants are unarmed