Thank you so very much for your specialized talents and willingness to work with us novices. I do so very much appreciate it.
No to the size of the OSM area, I have tested it down to a square mile or two with no changes in the house density. I agree that OSM data is very spotty, I have that around where I live also. I would think Titusville Florida would be up to date with good data but, who knows.
East Center Florida where it land juts out to the East is Cape Canaveral/Kennedy Space Center. That is the area I am working in today. -80 w 29 deg will get you in the neighborhood.