Remove the current state of all carbon mob xenos and start again with a hunter xeno. Before the uproar hear me out, because to compensate the simple mobs would be given a upgrade that they deserve, right now the simple mob can function at a capacity roughly equal to a xeno without special abilities and that's a good self limiter.
Now with this biology in place, other than admin spawned larva (in which you keep the carbon based xenomorph types) all xenomorph eggs only burst into simplemob larva instead of ghost controlled larva and go off the predictable ecological pattern of turning into a drone first or randomly another caste (so you can still misfire if you run deliberately up into a facehugger egg) with sentient carbon queen dropped eggs (egg sac eggs) carrying a special ghost role inheritance trait that allows player xenos to populate, so both xenomorph system work in parallel to each other and a the round ending intelligent xeno apocalpse is delayed.Xenos are given AI to properly set up a hive with a specific pattern, when a simplemob xeno queen is left unattended they will build this pattern, sentinels will work on a tether of where the queen currently to a maximum number of tiles, hunters on the other hand will instead of slashing wildly, tackle surrounding carbon mobs and drag them to one of the nest spots & secure where if built & kept correctly
EI of xeno behaviour inside the nest - If you are not lying down, the sentinels & queen in the nest will attempt to spit neurotoxin at you, and if you come too close standing up they will slash you (until you are lying again
How xenobiology slots into this then is that sentiencing a larva with a pink slime potion will allow a ghost to take control of that larva & grow up into a obedient carbon hunter or sentinel tied to their xenobio master. Effectively giving them control to domesticate into the round.
[*] Carbon intelligent xenomorphs are still as powerful as before, but now are admin button exclusive
[*] Xenobio get another limited antagonist like the changeling to play with by use of sentience potions that is aligned to a master & doesn't breed
[*] That subservient carbon xenomorph will have organs, which scientists can extract for tech making it much safer to bring to the station, but still a local xenobio not station risk
- To tie in with this, R&D with high biological tech can create 'backpack surveillance' that follow onto certain mobs by use of a electropack-like mounted combined exosuit & backpack slot object, which means that the friendly xeno (or about any xenobio creature with one) can carry a inbuilt device (which cannot be removed by itself) that follows its progress and allows the AI and crew to monitor it. Its also useful on other creatures with back/body slots like ian.