I think I would manually harvest the hair algae and try a lawnmower blenny if you have not already done so. I am a firm believer in macro algae in a sump. It seams to consume the nitrates and phosphates faster than the hair algae. However, not everyone has the room to run a sump. Just make sure you keep up on the water changes, maintenance on the RO filter and change your halides every 9-10 months.
BTW, great job on the recovery so far!