I hope I am not completely heretical in the following, but I have never seen a "conflict" between so called "predestination" and free will.
Since God "sees" His creation from outside, and time, change and causality are all features of creation and they are not attributes of God, of course there is a difficulty of comprehension for us here. We do, however, crawl along the celluloid and experience it frame by frame whereas He has the whole reel in His hands so to say. And we know that, in our sequential reference, we DO have free will, free choice. Timed language makes no sense here, but one could equally say "our choices already happened" from the perspective of God, or that God has "foreknowledge" but I believe both ways of saying it are equally meaningless. Because in our frame of reference these things haven't happened, and we are given foreknowledge only in exceptional and carefully considered situations. And even then, it is not the immutable foreknowledge that God has, but rather potentiality - see Jonah.
This is not such an absurd thought. Physics can be interpreted to say that if a photon were conscious (which it is not), then in a way, it has already experienced the entirety its own existence, and presuming it is not absorbed or transformed along the way then it is already "at the end of the world" because for said photon there is no sequential time. But from our reference, the photon is moving and exists in our time. When it lands on your retina, the photon from that distant star, for you, had been travelling for millions of years, but for it no time has passed at all. I'm not comparing God with a photon, God forbid, I am just saying that accounting for frames of reference is important at all levels and extreme frames of reference exist even here on earth as it were, let alone when we're talking about Heavens.
I do not understand these things, and I genuinely do not think I could, but I submit this passage from St. John of Damascus for discussion:
"The Deity, then, is quite unchangeable and invariable. For all things which are not in our hands He hath predetermined by His foreknowledge, each in its own proper and peculiar time and place. And accordingly the Father judgeth no one, but hath given all judgment to the Son. For clearly the Father and the Son and also the Holy Spirit judged as God. But the Son Himself will descend in the body as man, and will sit on the throne of Glory (for descending and sitting require circumscribed body), and will judge all the world in justice." (An Exact Exposition of the Orthodox Faith, emphases mine)
To me this implies that Christ will be judge in a state that experiences sequential time, therefore in Christ's reference the concept of "our choices" is meaningful.
I also corroborate this: "But about that day or hour no one knows, not even the angels in heaven, nor the Son, but only the Father." Matthew 24:36 -- which implies to me that it is possible and scriptural to infer these things.