The install win issue is not affecting 1.4.3 but I think we are facing a different issue related to sieges un 1.4.3 too. The reason is that the AI assaults settlements as soon as siege preparations are done without siege equipment (sometimes AI just makes a RAM and attacks).
This is bringing a huge snowballing because defender armies have no time to react. And yes, Kuzhaits are more insane/OP than ever.
The Vlandians took 2 towns and 2 castles from the Southern Empire in the first 15 minutes of game play. Something is really messed up. Kuzhaits had taken most off the map in the East after an hour in. Did they test this at all? I noticed it within the first few minutes.