Don.
I guess you are about to write a book on the VIICs. On the various threads there are a lot of information which could be organized, the problem is to evaluate which info's are the right as many are assumptions.
The WW2 story of U 995 is a story of an average Uboots operation in the Artic, focusing on the allied convoys to Murmansk. A norwegian has written a book of 97 pages on the subject concentrating on U 995, but included parts of the other VIICs and one XXIII taken over by the Norwegian Navy.
The book is unfortunately only in norwegian, it contains many interesting details as to the U-boot warfare including correspondence and interview with Hans Georg Hess, the last CO of U 995, at an age of 21 being the youngest CO of a VIIC ever. He became a lawyer holding a PhD after the war. He had a meeting with some ex preys ,norwegians convoy gunners, on board the U 995 September 1992. I believe he died in 2009. Below a photo of the last German CO of U 995 Hans Georg Hess taken September 1992 on board the museum U 995.
Tore