acolytes,
I can see and agree with several of your thoughts on Adam. As to Adam's original perfection, I can use the example of Jesus to illustrate the difference between physical and moral perfection. Most people who believe in Jesus and the biblical accounts would agree that he was perfect, however he was tempted several times by Satan shortly after his baptism. If Jesus would have no ability to sin because of his perfection, what would have been the point to the temptations? The angels were "perfect", yet many fell to sin starting with Satan. If free moral will comes into play, I think that a being can be perfect yet still make a choice to act that could result in displeasing God. That very act could also be a conscious disregard for the very God that they formally had submitted to. If a person isn't a believer, than none of this makes any sense!
As to "you will surely die this day", I would suggest that this could easily be read as the slow process of death began that moment Adam partook of the fruit. This would be similar to the phrase commonly used today, "the beginning of the end".
Just some thoughts...
TYA