You should think about planting those, let them grow up about an inch thick, and then grafting them with known american persimmon scions. That way you have a local adapted rootstock that grows well in your soil with the production you want. Also, don't overlook the importance of sunlight in both growth rate and fruit production. These trees are adapted to persist in the substory for years just waiting and hoping a big tree will fall and they can shoot up and flourish in full sun. Just because its growing doesn't mean it has reached it's potential. I am for 6+ hours of sun on my grafted trees, most of mine are growing on the edge of thickets so one day deer can just poke their head out for a quick much and an arrow through the lungs. I also have chosen different varieties for different areas depending on drop timeI saw a pile the other day in town and thought that, but it's the native to the area that has me reluctant. All the native ones we have seem to not produce much if any fruit.