I started playing with Vassals on the past couple months but I am not sure how to play this optimally yet. In general, should you capitulate someone as soon as they are willing to capitulate? I've been playing this way but sometimes it seems like I should take more cities before just capping them (they often cap after 1 or 2 cities if I show up with a big enough force). Is there a peace vassal risk if I keep taking cities that makes it not worth it?