It might not have looked that way, but I was actually exceptionally productive the past few weeks. I just forgot to commit and push my changes after playtesting every single day.

So instead of small daily commits I give you one big one. Most of the changes are still pretty minor though, no grand new game mechanics or anything like that, just general polish of everything I noticed. I moved some techs around and increased post-Renaissance tech costs across the board because I was getting tired of tanks in the 19th century. I'm torn about the plague, the eternal plague bug sure seems to appear more often than in the main mod but not consistently enough to justify removing it entirely. Whenever someone encounters an eternal plague I'd appreciate hearing about it just so I can get a picture about how big a problem it really is.
As much as I feel the urge to volunteer for a trip to Siberia, I have to agree with Leoreth. There are too many golden ages. However I don't want to get rid of the cultural accumulation mechanic for it, or of Great People's ability for it, or the 2/3 UHVs one. For now I removed the free GA from the Olympic Park and replaced it with a free trade route in all cities and extra foreign trade route yield in its own city. I'll see about removing free golden ages from a few world wonders too.
The AI sure seems to love Oligarchy, especially compared to Dynasty. I'm not really sure what to do about it. I'm attached to the free specialist effect and can't think of any fitting penalty to compensate for it, and I can't really justify throwing any more bonuses at Dynasty without it becoming too good vis a vis Autocracy and Republic. The idea is to have both Dynasty and Oligarchy as sort of low upkeep low effect default options versus the other more specialized civics, but the AI just favors the latter so much more than the former. Perhaps a -10% Great People Birth Rate penalty to Oligarchy?
I finally started my super in-depth revision of all civs by alphabetical order, that means UHVs, UUs and UBs, but also favorite civics of their leaders as well as starting civics and world wonders they are supposed to build. Today I more or less finished the letter A, that is America, Arabia, Argentina and Aztecs. Arabia's Smokehouse UB no longer gives a free priest, only a priest slot. However it stores more food and provides +2 Food from Sheep, Deer and Cow instead of the regular +1, but it gives nothing extra from pigs. I don't like Argentina's Patricios UU but couldn't come up with anything better so for now it stays. I did change it from Infantry to Paratrooper though. Aztecs now start with Sailing and Alphabet, but lose Currency. Why Alphabet? Because they start with City States instead of Dynasty.
One thing I'm still unsure about is favorite civics. Let's take for example Roosevelt and America. It's safe to say that FDR's favorite civic as a person would have been Public Welfare, but his civ in the time he represents (20th century and beyond) it is definitely not supposed to favor it. I'm sure this is a problem with other leaders as well, but he is the one I noticed it most with. Should leaders have favorite civics based on what they personally favored even if their civ decidedly wasn't running it in the period they represent, or should their favorite civics be based on the civ even if the leader personally didn't like it? In the mainmod FDR's favorite civic is Capitalism, and I changed it to Republic as a sort of compromise for now.
Somewhat related question: Should Peron's favorite civic be Mercantilism or Public Welfare? I read (Wikipedia) about him extensively the past few days, and I'm torn on this issue.
Edit: Oh and Knossos now gets renamed to Rabd al-Handaq when Arabia flips it like it's supposed to. Thanks to Leoreth for his support. :*