The spots that I've sanded are really smooth, they only have scratches from the 220 I've been using. The spots I haven't touch yet are rough.
Rather than continuing with the sanding last night, I decided to remove my sunroof panel and finally managed to remove the side view mirror that had been stuck from the cars last paint job (I;'m assuming they painted the car with the mirror on).
I picked up some reducer this morning and plan on doing what you've recommended: finish sanding, seal and top coat. If I had more room, I would remove the hatch as the spoiler (which can't be removed) hangs over the side of the rear quarters. The solution is to keep the hatch open while painting, but it creates a sharp angle where the hatch matches up with the roof line. Consequently, I may end up painting the hatch separately--we'll see.