Post 5 of several: Germans in Carpathia
a.
Zipser Germans
There are 5 locations that I think should be striped Zipser in 1337 and a few more that should be looked at more closely.
Liptoszentmiklos: Nemetlipcse, Rozsahegy, and by 1337 possibly Hybbe were founded or populated by Germans.
Murany(alja) and possibly Rozsnyo: the 1495 map shows to Hungarian-majority area anywhere near Murany, and only barely to the south of Rozsnyo (exception is Jolsva, which had both Germans and Hungarians, but it seems to be right between Murany and Sajogomor); on the other hand, there are Germans there that can be traced back to 1326 (Dobsina), between 1243 and 1344 (Csetnek), and "sometime in the the 13th century" (Rozsnyo and Nagyroce). Murany should probably be striped with Zipsers rather than Hungarians; Rozsnyo is probably fine as is but I'd recommend looking through any sources you can find.
Gonc and possibly Kassa: the Germans in Gonc can be traced back to late 13th century (Gonc). Nearby Telkibanya was also a mining town dating back to 1270, and mining at the time was dominated by Germans. Slovaks, on the other hand, didn't extend that far south in large numbers. Kassa also had a lot of Germans, but I don't know if they outnumbered Slovaks. So Gonc should probably be striped with Zipsers rather than Slovaks, and Kassa should be looked at just like Rozsnyo.
Nagyberezna and possibly Verecke: Data from 1337 is unavailable, but 1) Nagyberezna had at least some German influx between 1240 and 1400 and 2) by 1910 both Verecke and Nagyberezna had almost as many Germans as Ruthenians, and the only reason I don't suggest making them both have a large German minority is the unavailable data. My conclusion is that Nagyberezna should probably be striped Zipser.
Huszt: Germans formed a significant community around Tecso by 1337, while Ruthenians probably didn't migrate into Maramaros in large numbers until the 1400s. Huszt should be striped Zipser rather than Ukrainian.
b.
Transylvanian (Siebenburger Germans)
Disclaimer: I will be referring to Transylvanian German as Siebenburger in this post; I think they should be renamed to something and this is the best option imo.
Beszterce should be Siebenburger majority, Transylvanian minority. Beszterce, Radna, and Naszod were all founded and populated by Germans before 1300, and the region didn't become Romanian-majority until roughly 1700.
Szek should be Hungarian majority, Siebenburger minority. "Nosnerland", of which Beszterce was the center of, extended well into Tinto's Szek location, while the Transylvanian population of the region was relatively low until... 1500s or so?
Regen should be Siebenburger majority, Hungarian minority. Like the rest of the towns mentioned, it was founded and populated by Germans, with a largely Hungarian countryside. Szekely should only make a very small part of the population since Regen isn't part of Szekelyfold.
Aranyosbanya should be Transylvanian majority, Siebenburger minority. To the best of my knowledge, Hungarians didn't settle those mountains in large numbers.
c.
Danube Swabians
Both Buda and Nograd should have a large Swabian minority. Buda's Germans seem to be a bit harder to trace than Nograd's Germans; the latter were definitely Swabian while the former were probably a mixture including Swabians; I think it's fine to keep them Swabian for simplicity. As far as I can tell, those were the only two Swabian locations before about 1700.
d.
Germans in Moldavia
Several towns in northwestern Moldavia were founded by Germans; at least some of those Germans are believed (though it is unconfirmed) to have come from the Beszterce area, so I think they should be Siebenburger. They should be the second-largest culture in Suceava after Moldovans.
Siret and Targu Neamt also have a history linked to Germans, but not enough for them to be visible on the map. Siret, while founded by Germans, should probably keep Halychian as its second-largest culture, as there is heavy evidence of some East Slavic settlement in the area and the Germans aren't mentioned after 1241. Targu Neamt is mentioned as being largely Slavic around 1390; I'm skeptical as to how well that translates to 1337, but I'm guessing that there were more Slavs than Germans at the time. So both Siret and Targu Neamt should be Moldovan majority, striped Halychian, with some invisible Siebenburger.
Edit: here's the map: