tell me honestly would such a regime and civilization have better or worse odds at creating FAI or surviving existential risk than our own?

Surviving existential risk, probably. But, unlike today's inefficient corrupt narrow-minded liberal oligarchy, such a regime would - precisely because of its strengths and the virtues of people who'd rise to the top of it (like objectivity, dislike of a "narrative" approach to life and a cynical understanding of society) - be able to make life hardly worth living for people like us. I don't know whether the decrease in extinction risk is worth the vastly increased probability of stable and thriving dystopia, where a small managerial caste is unrestrained and unchallenged. Again, democracy and other such modern institutions, pathetic and stupid as they might be from an absolute standpoint, at least prevent real momentous change.

And their "F"AI could well implement many things we'd find awful and dystopian, too (e.g., again, a clean ordered society where slavery is allowed and even children are legally chattel slaves of their parents, to be molded and used freely) - unlike something like this happening with our present-day CEV, it'd be a feature, not a bug. In short, it's likely a babyeater invasion in essense.

(more coming)