I tried to play as Asturias on Very Hard. I'm finding it impossible. The port of Santander and the town of Braga will always rebel, and your starting territory of Galicia will take a while to pacify due to the limited building slots for public order buildings. On my latest attempt I tried simply abandoning Braga and Santander and focusing on maintaining Galicia, but a full stack of Asturian Separatists came up from Braga and invaded just as I was on the verge of finally pacifying the region. They promptly began taking over my settlements and reversing all my progress.
How do I win this thing?