Well,
I am certainly no expert, and the total of my experience is based on a state that allows sunrise to sunset hunting.

From what my friends that hunt several states say is this;
The birds in the states that stop hunting at noon are far less wary and call shy than the birds in the states that allow all day hunting.

Here, in Mississippi, we have lots of birds. But, they are heavily hunted in most areas and by the third week of the season have been chased, called and harrassed all day, every day and really become shy. I have watched gobblers actually get up and fly away at the first cut, yelp or purr.

We have a horse stable in middle of the area where we hunt. The turkeys flock to the stables and designated fields because they have learned it is a relatively safe area. It is a great place to observe turkey behaviour and try out your calls. During the first couple of weeks of the season, typical turkey behavior. After the season has been on for a while, if you walk into the fields w/ a horse, they ignore you, but pull out a slate and give a little yelp and they clear out, fast. These guys get pursued from dusk till dawn (people hunt around the fields) and have equated calling w/ getting shot at.

So, I don't really know what the answer is, but just wanted you to know that there is a down side to hunting all day.
R
Hank