Dize, you are leaving out the most important factor preventing the duplication you (and the rest of us) would need to facilitate total reality; Wolf packs
We do not have them and to structure everything to simulate the convoys as they were attacked by wolfpacks when we are all alone might make it more unreasonable than unreal action that is limited.
I do agree with your general approach. I have made my own RND file and use most of Jason's convoys in that. I have reduced the traffic around GB (That is the UK Jason) and have left it alone in the IO, SA and Car but reduced the sighting reports for those over what they were.
In 1941 I am getting 2-3 sighting reports out of France to Iceland and back but my my objective is to find convoys, which would be what BDU would really want, IMO. The game lacks range to go to the far reaches and that should be addressed but I do wonder if a simple increase in fuel that is unrealistic to simulate Milche Cows might do it. So for now I am a NA convoy hunter. Putting the escorts as all verteran or elite makes it all more challenging.
I sink an average of 1 ship not in a convoy per patrol and make 2 convoy attacks per patrol so my average is 4-5 ships 30-45K per patrol in 41.
In 42 the big change for me is less single traffic and the damn air patrols but those avoided I still get at least a good convoy attack and a single every other patrol. I averaged about 30K per until patrol number seven where I made the mistake of trying to find out what kind of plane was reported before making a dive. I will miss that boat and crew!!!
Wulfmann