(...) That said, I do run an absolute monarchy toward the 1300s and above. I am always trying to get the highest authority possible and I do like to have some archbishops/ doges here an their.
May I ask why? I never saw the point in going higher than medium. The only thing the higher levels seem to do is make the vassals more unhappy. And that means they're more likely to plot and join factions and also, more importantly, lower relations actually mean less levies. Also, if you're running an elective monarchy, it means they're less likely to vote for your chosen successor.