< - Removed the scaling war exhaustion cost reduction and stability cost modifiers from seats in parliament.
< - Buddhists no longer pay any diplomatic cost for releasing nations, releasing vassals and returning cores.
These are actually making CM and Buddhism usable.
< - Administrative Efficiency now also lowers AE generated.
< - At least 50 AE is now required for a country to join a coalition (up from 30)
< - Taking provinces from a large country now reduces AE generated by up to 50% (uses the same scaling as increased AE for taking provinces as a large country, so a country taking provinces from an equal sized country gets neither a bonus nor a penalty regardless of size).
Maybe just make it proportional - the more you have AE the faster the decay base, like +1 for each 100AE opinion.
Also AI should understand "I kill everybody except you": if I conquer provinces in countries around a certain country, while not fighting this country or just never taking its land(or all its cores in my territory have been revoked/expired) - I shouldn't get as much AE with it when I conquer provinces in other countries, and it should decay faster. Otherwise you'll always have a few angry 400AE countries, which you don't need to attack, because they're not in the way of anything.
Also there should be an alert, with game pause, when you've reached the MP cap.