I have four things to say:
1. first and most importantly... Very nice job. You have obviously sent your share of tonnage to the bottom. please understand however that I dont mean to belittle your accomplishment with 2, 3 aand 4 but i must ask for my own satisfaction...
2. I count no less than 6 escort vessels all weighing in at under 1250 tons
each. are you seeking historical accuracy? or just having fun with the game? because if it is historical accuracy you are after... the brits will have built a replacement for each of those escorts - (or scalped them from canada or the USA) before you ever get back to port. in the future... save those expensive torpedoes for merchants carrying bullets fuel and rifles to the enemy ashore, after all thats the purpose of the u-boat, to win a land war by depriving shore based forces the materials of battle... but if your playing for the heck of it... disregard.
3. what realism settings are you using? manual targeting? weapons officer assit? etc
4. the empire, the granville, the tramp steamer and the small merchant are the only targets of real merit where Bdu would be concerned. they would likely be quite dissapointed to hear that you sunk more escorts than merchants.
but overall, nice work out there, hope you make it through gibralter okay, might stop in at bessel or somewhere for more torpedoes !