Yeah, it's a somewhat big list and still in flux. But I'll include some here (and later when its less in flux I'll probably just update the description):

genetics & mortality borrows from "Genetics, Fertility, & Mortality" but takes it a step further. Fertility is further nerfed slightly. This might sound like an issue, but you still see both your player and AI players generate the child cap before death. They're just spaced out more. Beautiful tree has reduced diplomacy and fertility boosts. Genius offers fewer stats across the board. Herculean offers less health and prowess. Strong blood from strengthen bloodline was nerfed. The dynasty perks for improved blood lines was nerfed.

I also integrated a mod called Hard Difficulties, but had to tweak it slightly because I reduced the domain limit elsewhere. Not much change here though tbh.

I integrated a mod called Taberna and made changes here too. I raised the baseline of 'normal' stats from 10 to 15, and reduced some of the benefits Taberna was offering you. I think that author was shooting for offering you more boons, I had a different take. That said, I did keep the extra lifestyle xp cause it's kinda nice. Debating reducing it a tad, but not sure yet.

I nerfed the opinion modifers from prestige and from piety across the board. I also increased the penalties for religious and cultural hostility. Virtues are worth half as much opinion boost

Artifacts I just cut the prowess down by half roughly. So it's somewhat less ridiculous. That said I still got to 81 prowess even with this mod, and I didn't even have herculean genetics at all. So tbh, there's probably still room for improvement here

Court Grandeur above expectations opinion modifiers were scaled back quite a bit. But you're still in a very powerful spot if you manage a micro kingdom with 10 grandeur and only level 1 expectations.

Mercs and holy orders have more knights

AI kingdoms and empires will generate new guests up to a higher limit than previously. So they have access to more potential knights should they choose.

Fixed poetry interaction being backwards on diplomacy

I'm still verifying it, but several opinion penalties related to war, rivals, and crime should be stronger and last longer

There's also some borrowed traditions from a mod called More Traditions, but this is just temporary as I was toying around with it. They don't really belong in this mod.

oh almost forgot regarding the Taberna stats. the big 2 you'll notice besides what I already mentioned. General opinion is nerfed both by raising the expectations from 10 to 15, but also in scale (you get less per point). Second, domain limit increases for every 10 stewardship you get, rounded down

friendly counsel perk in diplomacy lifestyle tree was nerfed in half. If I can figure out how, I intend to nerf Learn on the Job in learning lifestyle tree too. But haven't yet

seems interesting, I might give it a try