I've been playing for about two years, so I know my way around CK2 fairly well. That said, AI decision making, especially regarding plot support, is one of the most opaque mechanics to me. I accept base reluctance and opinion only mattering at multiples of 25. Even then I end up with baffling circumstances like having 6 + vs 3 - in the decision screen, yet they won't join my plot. So clearly I'm missing something here, right?