I had a small CD ketch on a lake just east on Nashville several years ago. While it was fun having my boat close-by, I think you might be happier where there's more open sailing and a preponderance of fresh breezes.
To compound the issue, the hills around Nashville are only gentle slopes, allowing for a fresh, fairly constant breeze ...maybe a dozen times each year. Douglas Lake is in the East Tennessee mountains ...will take a very tall rig to catch any wind there, in my opinion.
A quick rumb line on Google Earth puts Douglas Lake about 300 miles from Charleston, SC, in the long run you might enjoy your boat more there, or in a lake that's not surrounded by mountains.