As far as I'm aware, much of this is hard-coded and can't be altered. There are very few easily alterable components that make any distinction between the AI and the human player, and no (practical) ideas regarding barbarian ferocity at Chieftain vs. Deity and all levels between beyond what's already there.
One left-field idea though to affect the science question. If you created multiple versions of rules.txt for each level, you could change the AI value of writing, the republic, university, trade, democracy, the corporation, and computers to be higher. The AI will be more willing to seek out research and trade-oriented technologies and government types, and potentially boost their scientific inclination. A long shot at best I confess.
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