...suggestions for Ukraine (moving from west to east):
http://www.soloveyonline.com/eu2/concept/ukraine.gif
1. Change borders of Red Rus (Ruthenia, if u absolutely must, but it does sound strange to us, so-called 'ruthenians'), Volyn and Chelm. Historically, Galicia (Red R.) and Volyn were apprx. the same size.
2. Change borders of Podolia and Braclav - they never extended that far north and east.
3. Remove Kiev province. Ukraine should have Kiev as capitol, it makes no sense to keep them separate. Just because Russians got Kiev in the peace of Andrusov it should not be represented as its own province.
4. Instead of adding Kiev province, add one to Zaporozhie. Zaporozhian lands extended to both sides of the river Dnieper. A two province Zaporozhia will be historical and more fun to play, if someone designs a scenario for it. I am not sure about the names for these two provinces, any suggestions are welcome. Some variants: W. Zaporozhie - E. Zaporozhie, Kryvyy Rih - Zaporozhie. Still researching the subject.
5. Made Cherson area smaller. I do like the name, since the city has been there forever. Jedisan was rather temporary.
6. Enlarged Pereyaslavl province at expense of Chernigov. More historical border.
7. Migulinskaya is a very modern name. I am sure you took it from Vicky. Don province would make more sense as for the most time of EU2 timeframe it was controlled by Don Cossacks.
8. Rename Novgorod-Severski to Sloboda. Possibly break Sloboda into Belgorod and Sloboda. Different border variants are suggested. Sloboda was to the south of the city of Belgorod and to the south west of the city of Voronezh.
9. Extended Taurida a bit to the east. Crimean Tatars did control the mouth of the river Don for a long, long time.
This is it for now. Please let me know your thoughts.