You have to remember that Calvinism is far from united on this issueThere is a lot to parse out here (and I'll do that later Lord willing), but the more I read you the less it seems you understand Calvinism (Determinism). I don't mean that disparagingly, but what you're describing is more akin to non-determinism than to determinism. There is no "optimal" choice of God or any "freedom" of creatures in Calvinistic theology. Everything that occurs is normatively decreed.
Jonathan Edwards explained that Calvinists and Arminians both believe everything is predestined - either via divine decree (God causing it to occur) or in that God knows what will occur - so in practice there is no difference (the difference is philosophical).
Many Calvinists do not consider Edwards a Calvinist (based primarily on his explanations in Freedom of the Will) while others uplift him as a Calvinistic scholar.
I say that to say that you are broadbrushing Calvinism by arguing against Calvinistic theologies with which you disagree. Granted, those positions reflect the most vocal aspect of Calvinism today, but the most prolific is not always consistent (e.g., they are deterministic yet still consider Edwards representative of their views).
How do you come up with the conclusion that Calvinism excludes individual free choice?
Note: I am not a Calvinist. But I do believe everything is predestined while affirming free will (in the normal sence of the term, not libertarian free will).