A bad memory then. I'm sorry for having spoken ill of your mod as I did. I had the vague memory of a Babylon rework in a vast rework project where they were limited to a 90% Eureka.
Just took a look back to the mod, and indeed Babylon doesn't have it. Not a fan of the new ability you gave them, but it's way better than my memory. Lost the gimmick though which I loved and the asymetry, but that's a choice that I can understand.
I sincerely don't know where my fake memories when. Next time I'll speak ill from the mod, I'll make sure to check the mod before
As for the rest (the Gallic ability to put districts next to the city center, Maya's inner circle extended to 9 tiles, Kongo able to found a religion...), it's a matter of personal preferences, I guess. I loved their restrictions and I'm sad that they're gone.
On the other hand, one thing I find fabulous about your new designs are how being suzerain of city-States (well, tributaries as you call them) tie with so many civilizations. I wholheartedly disagree with a lot of your choices, but you still have some incredibly good ideas.
Other question then: have you an idea how you will modify Portugal then? I fond them so well balanced that I'm genuinely curious if you already have some ideas for them.