God as First Cause does not mean he does not interact daily! Maybe that is why some people like, "Uncaused Causer", better than, "First Cause". But "First Cause" is not a merely deistic notion. It is an indicator of position on a logical sequence —cause and effect— and no reference to time passage.
You say, "The question is: why can't God allow man to make or not make some of these "changes" which He allows to go either way with man making the free will choice." And I say, He does! In fact, he not only allows man to constantly make (or not make) these "changes" according to the free will choices of man, but man does so according to the decree of God.
You, as before, reinterpret what I say to mean something it does not. Logically, all things are caused, except First Cause.
BUT: Your words there, I agree to. Your use of them, not so much. You say, "...to go either way", by which you mean, "it is not pre-determined which way they go". But it most certainly is determined.
You can't show me any time that things have gone more than only the way that they have gone. Nor can you show, except by conjecture, that they ever will go more than only the way that they will go. So how can you say that they could have? You don't know that! All you know is that that is the way you think. You do choose, between what you take for possible paths/options. But your choice will always be whatever option God already decreed to come to pass.
And yes, don't even bother to go to the many many passages where God places the choice before man to make, and not only that, but names the contingencies as to what is going to happen, depending on which choice is made. That does not imply that God has not already determined what the choice will be. We've already been through that supposed evidence that God leaves anything up to chance.
There is no such thing as chance.