I've played a few games with the recent patch (CPP+just AI from CBO). Thoughts:
TL;DR: less bribe wars, more wars of aggression; tactically the AI need to PUSH when they have clear advantage.
DoWs are non-stop sometimes, literally, I played an entire game that I was in non-stop war from about T90 on. I never once DoW'd another AI, took a city (like I could), or even dissed anyone, at least until I got 6-piled at one point and finally could get ahead of the situation afterward. I got caught in a DoW/diss spiral that I couldn't escape from. I even had one of them as a coreligionist, super friendly most of the game (Maria), then backstabbed for no reason ($$$). At the same time, due to mass-dissing, I couldn't get DoFs or DPs until around the Industrial era.
On the one hand, this was probably the most fun I've had with Civ in a long time, and ranks among my favorite all-time C5 games, and an extremely satisfying if late win. On the other hand, it was ridiculous and frustrating being so locked out of positive diplomacy because of the diss spiral. I think a lot of it was just geography, though. The map divided into two large factions eventually, and I was about 80% of the border between them for the early to mid game, so every army came to me from the opposing faction. Eventually, it opened up.
I would say, as such, the AIs mostly made good DoW decisions from a grand strategy/faction standpoint, and I just got unlucky with placements.
Tactically, the AI continue to be useless and far too passive. For sure, had even half the AI pressed me with their armies, I would have lost at some point, certainly in the 6-pile. They don't seem to war to win, just to dance armies around, even when they commit troops (50% of the time at best). When I'm facing 4:1 numerical odds (note: I jacked up every strat's mil training rating to 7 or 8 for fun), they should be shoving armies at me full blast, but they rarely did anything close.
I'd much prefer a tactically aggressive AI that's more even handed diplomatically, but I recognize you're working with what you have on that front.
I do like the aggression actually, it makes the games actually challenging. It just needs to be less "I'm bribed into this" and more "I want to steal your land right f'in now". Don't overfix this and make the AI both tactically and diplomatically passive.
[I'm assuming the tactical AI changes are in CPP as I didn't see them explicitly in the CBO files. If they're in there, then you can ignore my tactical concerns I guess since I likely accidentally turned them off.]