As my budget is not the best and the DLC system from paradox is not good either, I've come to a few bugs imbalaces in the game, mostly from the states system the lack of a queen made marriages with a state an add loyalty and influence button, being a trade of stability and corruption modifiers.
But mantaining them loyal was only woth if the stayed loyal, so i ended up putting the influence of the nobility( i played as France mostly) 100+% all the time, and the corruption was still very easy to lose control, while AI got barely any corruption, payed on both normal and knight. and I kinda don't like churches as a building i feel like they should add more of a buff to the state loyalty than anything else.
Since there is no way to change the point of equilibrium of state loyalty without DLC, and theyr loyalty is very important for corruption and autonomy. coud there be any way to add more ways to alter the states on time on an amount of years, i loved the fund loyalist button, but it's too expensive, has too long of a cooldown and just get over shadowed by spanning marriages.
I'm 99% sure the AI abusses Marring with state too, fixing tthat'd be great already, but lowering the costs and the cooldown of funding loyalists feels right too.