Lucasif, you might want to consider making it so that colonizing efforts would also give Reassembled Ship Shelter extra colonist jobs. Right now, you'd get too many initial colonists with not enough jobs, giving you a happiness hit (and thus stability hit) through it, until you have enough jobs for them. This would semi-fix this issue.

Or maybe a happiness modifier for 5 years on new colony to counter this.

I did think of adding a happiness bonus, but ultimately decided if you're taking that perk you're probably managing your new colonies pretty pro-actively. Next time I play around with it I'll see if it needs a happiness bonus.

First off, I want to say well done on the perks. I like my perk list full of strong options, and this is one of the better mods making that happen. Thank you.

Especially with the tiered perks, it's wonderfully possible to specialize in a particular aspect of your civilization. But it is on those that I must note a caveat, for balance:

Where the tiered perks offer a discount, or a reduced upkeep, it's probably worth a second look to see if doubling and tripling that discount is appropriate.

Taking the megastructures perk, for example. At tier 1, -25% to megastructure costs is great. At tier 2, -75% cumulative to megastructure costs is incredibly strong, and prompts checking if there's anything else available to reduce that cost to just shatter the game with free ringworlds and whatnot. At tier 3, -150% cumulative to megastructure costs answers that search, and makes it clear that a cap is in place at -90%.

And sometimes, you find that there isn't a cap, and you can gain society research by poking genetics.

Overall, due to how the discounts stack, it might be better if they just repeat on tiers, rather than increasing. So -25% at the first tier, -50% cumulative at the second, and -75% cumulative at the third.