The only thing that might be worth editing is the location of Konin. You have it a hex north of Warta, but it was mainly on its southern bank:
https://en.wikipedia.org/wiki/KoninArchitecturally, the city of Konin is divided into two historical parts - Old Town (Stary Konin), situated on the south bank of the Warta; and New Konin (Nowy Konin), spreading northward from the river and developed primarily after 1945.
I`m only mentioning this because this being a map correction of an epic screw-up it will undoubtedly attract scrutiny.