Regarding to Arcology buildings:
Aquarius Protocol: Mostly useless. You simply can not ignore defense buildings if you wish to keep your planets safe. And they already gives you stability 10 or so. Even +6 wont change anything. See no reason for player to build that.
Suggestion: give this building additional function to justify using a structure slot. If it able to "suppress crime and extremism" it can remove LP cells, negate pirate activity, reduce(nullify) demand for drugs and organs or even do some of this system-wide. Pick any or add more...
Pheromone Splicer: Didn't test yet, but sounds like really OP thing. Like "terraform into arcology, increase population to 10, terraform to terran (or other type)". If you does not consider nerfing the structure, there are other way: make arcology transformation irreversible. Again, can do some much decreased bonus system-wide.
Smart Grid: Hazard rating is not what player want to change at the cost of slot. Especially if it have upkeep, even if it's small. Again, need some more functional, like +1 to production for all other buildings (with Alpha core).
P.S. Nice job with update!
Would it be possible to re-add desert planets in some form, for the sake of the spice harvesting industry? Or possibly make spice harvesting also available to arid worlds?
IIRC it already available on arid planets.
For the great justice! © This is heresy!