Lets cut directly into the suggestions 
A) Make claims more meaningfull by increase the base coring price and increase the claim discount on cores.
B) make it more rough to gain claims, but easier to historical rivals.
C) Culture change cost reduces a little, but takes MORE time, and at same time Nationalist Rebels Revolt Risk +3-5%
D) new "Genocide" decision avaible when the Main culture doesnt cover the Majority of the population.
E) Genocide Decision will make All province against Target culture, pop up large amounts of Rebels across the lands, when (if you can >) beaten you will have significantly easier or automatic changed that culture to main. However great diplomatic reputation strain.
just some thoughts.
A) Make claims more meaningfull by increase the base coring price and increase the claim discount on cores.
B) make it more rough to gain claims, but easier to historical rivals.
C) Culture change cost reduces a little, but takes MORE time, and at same time Nationalist Rebels Revolt Risk +3-5%
D) new "Genocide" decision avaible when the Main culture doesnt cover the Majority of the population.
E) Genocide Decision will make All province against Target culture, pop up large amounts of Rebels across the lands, when (if you can >
) beaten you will have significantly easier or automatic changed that culture to main. However great diplomatic reputation strain.just some thoughts.
