Definitely looks like a shock-loss case to me. Pinning it on over-harvesting with just 1500 grafts doesn't make very much sense, but only time will tell. Like the majority have said, give it that (time). If there's a given constant after perusing these forums for a few years, it's that individual recovery and speed of results differs greatly from person to person. More importantly, how is the front coming along?
If you're self conscious about your current mothballed look, I think you would look particular good with a high to medium fade for the time being.