As far as which weeks to hunt all I can say is that I tend to see more deer the first and third weeks. Why is that? The only guess I can come up with is that during that first week the hunting pressure is fresh and the deer become more reclusive as the week goes on in reaction to it.
Then by the third week a lot of folks have either tagged out or run out of vacation time so the pressure lets off a bit and the deer become a little more relaxed than week 2.
That's all theory and guessing but I have consistantly tagged and seen more deer in those two weeks.