Yeah,
I've tried again both times around 2000-3000 both unsuccessful...
Perhaps it is the crew? (bloody mutineers and German spies!?!?)
Although I think if I get someone who may have a better understanding of the TDC that may help xP
Any how, I managed to get a new crew of 4 to help me sink the Klaus Jager! Hopefully successful. Thanks Chromatix & Napalm42!