Ok, very interesting. Before it goes any further let's concentrate on important points, shall we?
1. I like the idea of an event when Lithuania cedes some provinces to Muscovy (actually, I think we should limit ourselves to Tula only). This should occur for Russia only, be triggered by low Lithuanian centralization, they shouldn't be at war (suicide). Lithuania should always have a chance for executing the traitors, in which case its stability drops, relationship with Muscovy drop, but centralization increases.
2. Time of Troubles. I think it should be very hard to avoid. Have no idea how to implement it at the moment. I think it should be the first priority though.
3. As I said, Vladimir, Suzdal or whatever, the map is wrong, so let's live with that.
4. I upped relationship of Ryazan, Muscovy, Suzdal and Ryazan with Golden Horde to -20 -80 level or so in the first batch, will see how that's gonna work out.
5. Civil war in 1430s-40s is portayed with a war between Muscovy and Suzdal. In my test games, Muscovy have little problems with annexing Suzdal after the first one, so I think it should be Ok for now.
6. Serfdom. I don't understand why Muscovy etc start with serfdom of 10. Come on, if that was true, why would Ivan IV, Godunov, Alexei I and Peter issue laws which would make serfdom stronger and stronger??
That's it for now.