1. Your definitions of Monarchy and Tyranny don't suggest any real differences between them other than the likelihood that power in the Monarchy is inherited. Without any other differences between them, I wonder why the Monarchy should have a Trade minus and the Tyranny a bonus; the Monarchy get a Happiness bonus and the Tyranny a minus; and the other differences in Ground Combat and SY Rate. What do you see that makes them different in these attributes?
2. The Communists get a -bonus- in production?
3. I'm not seeing a big definitional difference in Theocracy vs. Religious; however the difference in Happiness (Theocracy -10, Religious +10) suggests that maybe not everybody in the Theocracy follows the same religion as the ones in charge of the government? If they are all true believers, why would they be unhappy?
4. I don't really see a connection between the goals of an Imperialistic culture, as you define it, and the the various plus and minus areas.
5. I understand the political difference between a Democracy and a Republic; I don't really see why this would result in the difference in their plus and minus areas. Why would the Republic be better at Research, Happiness, SY Rate and Repair, while the Democracy is better at Production, Space Combat and Ground Combat?
6. Some of them seem to be apples and oranges - some are political labels, some are more economic, others are attitudes such as Militaristic, Imperialistic, Isolationist. Although perhaps you intend to represent the one factor that is most important in summarizing a culture, so that while you might have several monarchies that are both imperialistic and capitalistic in nature, their label would depend on which aspect of their culture was most important: their form of government, their economy, or their imperialistic attitude?
I hope not to be over-critical, just to help you refine your concept a bit, perhaps.
SpaceBadger