NJwhit, Welcome again. And I agree that bird hunting behind a good dog is a rush.
Many farmers (not just in Iowa) have the same opinion, deer are beautiful but they are pests. I know several farmers who would not let people hunt 10-20 years ago, but after their (wife, kid, parent) hit one with the family car they started asking people to hunt.
I grew up hunting the East Fork of the Des Moines river and it's tributaries about 30 miles north of you. (before I moved to a metro area for economic reasons). I do not know the DNR's deer density counts by zone, but I think because of the lack of timber in the area your in, hunters are able to keep the deer herd in check pretty well there. And that too is why P&Y bucks are less comon in that area, they're some around in fence lines and abandoned groves, but it takes a pretty smart/lucky buck to live through 4 hunting seasons in that area.
I also do not know how the DNR comes up with their magical number on how many non-res licenses to sell, but I have seen how unlimitted over-the-counter elk licenses negatively affected elk hunting around Pagosa Springs Colorado a few years ago. Whatever the Iowa DNR is doing, most people who have hunted Iowa tend to believe it seems to be working to a certain degree. (some would say despite of the DNR's policies, but I think it is at least partially because of them).
IaCraig