I had a very frustrating game with lithuania! I learned from an old game that till mongols gone, u have to turtle, then you can expand. so the first goal was done with education + running artist in every town. obviously military and economy suffered from it. then focused on grow and workers, but the land was very badly developed. (kiev died out in 1100! recently they realy sucks as ai) Struggled to keep stability, i was usually in minus (5-10) from 1500 to 1600 it was a fun, except the war with germany who was superstrong. in 1569 i changed civics and made my religion to islam.
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pic: -12 in golden age!! never seen such a thing
then came the doom in 1600+ dow to moscow, then a few more dow due to def pact

took 2 city in border and then from -2 to -26 in one turn. kiev went indy then -50 stability.....
as i saw, the main issue was the first column. i never ever had problem with it. btw changing religion in late/mid game is a horror. in 1500+ i couldnt change with france to prot, cause it hit with -40 stability (+20to-20).
any idea about these?