As I see you do the GG thing, I can help but think, "Thank God, it is him doing that and not me!" I am so glad to have that behind me! The second layer of drywall is tough psychologically for some reason. Probably because it doesn't look any different from the first. In your case it does look different, so you may have a different perspective on the matter.
Have a good vacation, your GG will await you when you return
BTW, did you use the GG calculator? I thought it was guaranteed to leave you with half a case extra