There are several names and positions on the provided screenshot of northern germany, that are at least doubtful. It is easy to see, those names were not chosen by someone that knows the area very good. There are provinces, that would represent the real area much better with other names.
Only one example: "Malente" should be Plön. Plön even played a role in the last days of the war as a stage of Dönitz' withdraw of the new Reichsregierung on it's way to Flensburg. So this name, not only increasing correctness, would provide more historical taste. Geographically, the whole Hamburg are looks weird. Hamburg is definitively way too south, compared to the North Sea coastline. Otherwise, replacing it to the north doesnt fit with the location of Lübeck. And as already mentioned, Schleswig is in no way to be found at the shores of the north sea.
"Emden" is of course german. But the province that got named "Emden" is west of the Ems river delta and therefor it must be something dutch. This province should be dutch. Of course it could not be named Emden anymore, but a correct name for this area would be "Groningen".
Please keep also in mind, that Germany will be partitioned after the german defeat at the end of WW2. The impression of the historical border between east and west in HoI2 could never really satisfy.
I know it can be difficult for foreigners, to partition and to name provinces in a country, to the satisfaction of the players living there. And I fear it is difficult enough that Paradox will have no choice and remind us that the map (like other game features) will remain something to be regarded abstractly.
The other choice would be to trust us, the community and listen to one or two suggestions.
I volunteer to help at naming the german provinces and to tell you about erroneous province locations.