I have a few more questions to estates. Will Muslim nations in sea gain the brahmins estate or keep the dhimmi? Will sea Hindus get the vaishyas estate, which are the Hindu merchant caste? Can brahmins and vaishyas get the colonizing privileges that regular clergy/burghers have? In India that doesn't matter much, but sea has a lot of islands to colonize.
Because sea Hindus have the regular nobility estate and the brahmins estate you can grant both the supremacy over the crown privilege for 20% influence and loyalty to all estates. I don't think that's intended.
Any changes to the eastern inward perfection privilege? Most of the game it is just 2-3% Dev cost reduction, while you constantly suffer stab hits if going to war. For such a harsh penalty it should actually give a good benefit.
Any changes to Buddhism? It is such a boring religion, mainly because there is no choice involved. Christians have several boons to pick from regardless of their sub denomination, Hindu can pick god's, Muslim have the piety slider with several boons and buttons to spent piety. For Buddhism you always want to stay neutral.
Boons you can activate at a karma cost or the ability to pick the boons of either karma side would make the religion so much better.