Just a status report on perma-war issues:
My game is a save from previous version (beta 1.4.0). Running my own kingdom, since last version, and I've ran into perma-war issues as well. However, once conspiracy quest finished (2000/2000), I was able to make peace with pretty much everyone, except Kuzhaits.
Post conspiracy quest, I've had only had Kuzhaits declare war on me constantly, and immediately after peace. Aserai declared war on me one time, but I beat back a large stack (1k+) army then voted for peace. Same deal with Vlandians. During this period, Vlandians controlled their territory and what used to be Battania and part of northern empire. Aserai has all their original territories and some western empire towns. Kuzhaits would be way further, but I'm holding large swath of land in the middle (Zeonica / Jalamarys, Amityas, Lycon, Poros, Phycaon), and I've been personally putting a halt on them. Sturgia 1 city remaining, everyone else dead, with no fiefs. NE + Battanian no fiefs but have a few clans remaining.