Since he is a late bloomer and finally on track for a college degree it would be a mistake for him to derail his current momentum with an OOS move since it would require that year of full time work. Viable options include you staying the years he needs in Ohio or his psyching himself up for being a away from you. You need to consider the impact on your jobs if a delay is planned. Now may be the best time for the rest of your working lives to relocate.
Some day your son will need to progress beyond being near to you. Now is a good time for him to work on his independence. NC is not that far from Ohio for visits. His academic success should give him confidence. Practice independence in all those little things he relies on you for. Look at success, make it happen.