For pole beans in northern Florida, I have had great luck with the heirloom "Kentucky Wonder" as both a spring and a fall crop. A 16 foot row growing up a 7 foot trellis typically yields 2.5 lbs of beans every other day for several weeks before slowing to about 1 lb per day for several more weeks. I have had even higher yields with "Kentucky Blue", but I prefer the flavor of the original "Kentucky Wonder" despite having to "string" the beans when snapping them.

I suspect that planting bush beans in a 6x6 inch grid will not give you the yields reported by LSU. My experience with block planting bush beans has been lower yields per foot of "row" length. Beans planted in a single long row will get plenty of sunlight on two sides. When planted in a 4x4 block, the outer rows are partly shaded on one side by the interior bean plants, which, in turn, are partly shaded on both sides.

Courtney that fact that the block of bush beans would create its own shade is a great point. I appreciate your advice.

Do you grow any beans to harvest as dry?

You analysis is correct. But there might be difference in yield between pole and bush beans. THE BEAN WHIZs maybe able to answer that question.