I would've just commented this but I was a bit too thorough for the character limit so I'm starting this here, so me and others can give suggestions if they want. Anyways, if you're open to it, I have some ideas for gestalts:

I play hive minds a lot and I can see some really interesting stuff with them, especially in terms of massive growth. We could add a “cybernetic hive-node”, a planet-unique building which adds pop assembly for augmentation drones and increases hive-minded pop output in exchange for food/minerals and alloys. Maybe there can also be an upgrade for the permutation pool called “muto-synthetic cauldron” which doubles the effects of industrial districts on the permutation drone jobs, in exchange for also doubling the habitability reduction. Maybe then there can also be army techs, like cyber swarmers as a basic cybernetic army that’s cheap to make, and cyber-horrors as the big mean one with good morale damage on top of good stats. Maybe hiveminds could also have a tech like “superior gestalt linking” which decreases pop empire sprawl while acting as a gateway for “hive mind enhancement” which allows you through an edict to add traits for your immortal ruler, like building and district cost reduction, ship buildspeed, unity, etc. (I figure unless you’re a progenitor a hivemind wouldn’t want to focus on individual leaders as much, so maybe for progenitors they can get leader bonuses)

Assimilators I think deserve a bit of love from the cybernetic ascension themselves, since instead all the glory goes to their cyborgs. I think a tech like “bio-synthetic hybridization” could add new advanced traits for food upkeep, like an inverse of cyborg traits for organics as well as a “bio-synthetic” trait acting like a nerfed version of the normal synthetic trait. These new traits could also add a policy of “crucible management” which could do a mix of growth and robot assembly, pure growth, or pure assembly so you could get back the assembly from capitals if you wanted, and then some. There could also be some improvements to the new crucible worlds, such as a new building called the “crucible optimization hub”, a building only able to be constructed once on crucible worlds which adds 2 more crucible drone jobs as well as cyborg output improvement and assimilation speed for an increase in cyborg upkeep and slight alloy upkeep for the building. They could also have a new tech acting as a swap for netrunners, increasing codebreaking, as I imagine assimilators would fit being a subversive influence in the galaxy

Anyway, these are just some ideas, any or all can be implemented if you choose, or not if you decide not to. Also apologies for the text wall lmao, wanted to be thorough as I was having fun. Anyway hope you’re doing well and I’m really glad there’s a mod like yours here on the workshop giving the fairly weak cybernetic ascension some love, so keep up the good work! :)