I want to propose new government - feudal. It replaces "Feudal Society" civic. Main feature - vallal types. Feudals Have the lowest administartive cap - 20. And you can fix it by creation of vassals. Feudals have different types - feudal vassals, bishoprics, trade guilds (vassal corporation). Also feudals have access to enclaves - unique type of vassals, that based on the space stations - abbeys, free cities and castles. Feudals have own civics there short list of them:
Military orders (provide access for military orders enclaves, spiritualists and militarists only)
Nomadic traditions (can't build colonial ships, but can nomad habitats where you can build barracks, furnicase, farm and workshops districts only and can transform them into space ship)
Church's power (cardinals replace administators)
Inqusition
Merchant League
You can't use feudalism if you egalitarist or pacifict, because feudalism is order, where authoritarian leader gives land to their loyal military commanders if they will be loyal.