Seem to me that one important participant in the north Atlantic naval conflict, the Tirpitz, is missing here.

For those of you interested in the latest research concerning this mighty battleship, I can recommend "Tirpitz-Hitlers last battleship", by John Asmussen and Kjetil Aakra. The book was published one year ago, and according to my last information from author Kjetil Aakra, there are aproximately 100 books left.
The book has norwegian/english text:

- Tirpitz-boka English

Regards
RAM