That is an interesting contribution and worth thinking about.
It seems you are circling back to a 'strict determinism', which I have no problem with.
Do you think Adam's free will was different before the fall?
Actually, no, I was not addressing strict determinism.
This is what I was referring to.
Mark 7:20-23 (KJV)
20 And he said, That which cometh out of the man, that defileth the man.
21 For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders,
22 Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:
23 All these evil things come from within, and defile the man.
Out of a corrupt heart, proceed corrupt thoughts, words and deeds.
It is my guess that Adam, knowing that to eat of the forbidden fruit was rebellion and would lead to his death, nevertheless did not want to be separated from his wife and so put her above God, in that moment becoming an idolater. From that idolatrous heart proceeded his rebellious act.
I know that I can't prove the above, but I have proved that it's from heart that sins come, and, since we only ever do what we want to do, his heart already had an evil desire, before he ate of the forbidden fruit.
P.S. I think that Adam's will was the same as ours, in the sense that it was bound by his nature. A nature without any sin, would not sin; therefore, his nature became corrupt, before he ate the forbidden fruit.