I like the idea of the psychoactive mushrooms but I think it should work the way Volturnian Lobster works, by adding a sub-good of psychoactive fungus that counts as a unit of recreational drugs with a value bonus that increases based on the distance from the nearest planet with the Fungus modifier.
Otherwise the stability penalty seems a little high, which is OK as long as the penalty goes away when you make it a Free Port which already has people wandering around doing whatever super space drugs 3000+AD can bring
