lol enjoy it while you can, this is some major BS, the problem has already been identified - its because the 2cm flak is massively bugged / OP. Another streamer sunk a frieghter with it XD, maybe you should try that!. Uboats lead developer said it will likely be fixed in the next update (108). Ill be testing it again after that, and if those Sunderlands are still catching fire like they are made of paper and hairspray - he'll well, be hearing from me again :)
Yeah, you just beat out the real world record, U-441 only got 3, and that boat had apparently replaced the deck 88mm with a pair of flakvierling 38 quadguns. Was just reading up on the real type VIIc, funny thing is real ones had a crew of 44, wonder if you can upgrade that much?