After God made man, God called creation very good. It was not called slightly flawed.
At first sight, you sound correct about Adam not being deceived. However, may I suggest something. I am suggesting that Paul has in mind that the word "first" explicitly said in v. 13, is implied in v. 14
1 Tim 2:12 But I suffer not a woman to teach or usurp authority over a man, but to be in silence (hEsuchia, ruliness). 13 For Adam was formed first, then Eve. 14 And Adam was not deceived (first), but the woman being deceived (first) was in a transgression (first).
I don't think Paul is saying that Adam was not in a transgression as well. But that Eve was in transgression first. Since in Rom. 5:14 we are told that death reigned from Adam to Moses, even over those who had not sinned after the similitude of Adam's transgression. If both Adam and Eve transgressed, Paul does not seem to mean by " Adam was not deceived, but the woman being deceived was in a transgression," that only Eve was in a transgression. So we might infer that he also does not mean that only Eve was deceived. And we could infer that he means "For Adam was formed first, then Eve. And Adam was not deceived (first), but the woman being deceived (first) was in a transgression (first)."
So, he is suggesting that women are more easily deceived than men; not that women are deceivable, but men are not.