[Yef]

Well, I've been playing Proportions and the AI is building Cultural centers in new colonies.
It appears to happen only with 2 AIs, the Dopplengangers and the Kaelons. My guess is that these 2 are not optimized for Proportions.

Any idea how can this be fixed?

And how can I make the AI colonize at a higher rate?
Some AIs, like the Drucks and the religious race (what's their name), never expand beyong their homeworld, that despite having a couple colony ships orbiting their Homeworlds doing nothing.