I think that nerfing Aphrodisiac from 50% to 25% pop growth wasn't the best idea. You can only build it just when the colonization stage has ended, so bonus is not helping that much anymore. With all the bonuses to pop growth in tech tree across all races (some got small buffs, but all got 10% more from extreme colonization), this additional 25% is not doing that much.
Thalans got buffed too much. In vanilla they (along with Torians) were already most likely to become strongest Civ on most maps. Now they are just OP. 25% to economy is huge, along with a bit bigger bonuses they now get in the tech tree they are best in manufacturing, research, morale, economy, and military (ex. Remedial Engineering was 5 research, now is 10, they have bonus MP from Space Weapons, Defense Industries, and Stellar Production got even bigger buffs). I know other races have more bonuses in their tech trees as well, but playing as Thalans feels like setting difficulty down from Painful to Tough or even Challenging. Before, Thalans had to carefully balance their money vs production, now the money problems are gone and you can just sit on 2 manufacturing worlds in the early game and spam Colony Ships every 2-4 turns, and you can afford it for long. And when you colonize more worlds then 2 AIs joined together, you can roll a dice and either go for Influence or standard Conquest Victory. Game is won.
Yor got nerfed in Influence and Diplomacy area. Now, Diplomacy sounds alright as they are just a bunch of robots set on exterminating organic life in the Galaxy, but Influence is just going to hurt them much more as they are set on AIP7. There is a slight problem with those nerfs as well - all the races that suffer from low Diplomacy or Influence like Drengin, Korath or Thalan also have some really cheap or more expensive techs to even it out:
- Dark Influence (+10 Influence and Super Project) and Xeno Intimidation (+25 Diplomacy) for Korath
- Xeno Intimidation, Xeno Propaganda (+5 Influence and GA) and Xeno Brain Washing (+25 Influence) for Drengin
- Xeno Antrophology (+20 Influence) and Xeno Public Relations (+20 Influence), along with availability of all Diplomacy techs for Thalans.
Yor could use such a tech, or restore their racial bonuses to what they had before.
Another thing is with their economy, I already have been told that you don't want to lower population growth (it doesn' fit them as it is) from their techs, but there is one more thing. Previously, Economic techs for other races gave you +5 economy every second tech, now every single one gives you +5, but Yor still have their old Efficiency tech progression. Is this intentional, or someone forgot about them? Because now they are behind all other races in 10% economy, compared to previous version, and they were supposed to be those efficient ones...
Korx is underperforming as they always are, a lot has to do with them building Freighters instead of Colony Ships, maybe increase their Cut-Throat Trading purchase now reduction from 25 to 33? They can make a lot of money in a lot of different ways, but their Manufacturing is just average, so they can't turn this money into improvements or ships.
The Colonization techs are broken atm. I don't know if it's a feature or a bug, after you decreased manufacturing of Initial Colony. Now as you colonize an extreme world you are stuck with 1 point worth of Social Manufacturing (focusing doesn't help), and building on this world is practicly impossible without second colonization tech. This is a big thing for Iconians, who are stuck with planets they cannot use for a long time, as AI not always go straight for Advanced Aquatic and Toxic Colonization techs (as in, it takes some time). It is an issue for other races that get some basic colonization tech like Korath or Yor, but it hurts Iconians most. That's why they are so random, if they go for normal planets they do just slightly below average, if there is a lot of extreme planets they just hit the bottom in every rating, except population and maybe economy and it take a long time before they get those planets up and running.
One more thing, Basic space construction should be Basic Space Construction, it stands out