What Iddee said!! glad you checked!!
theres a little calander of sorts on my queens page if that helps. Day 13 you can move the cells, not before. Day thirteen from when the egg was laid, not when you grafted it. If your not CERTAIN you got one day old larvae, best be moving cells on day 13 or 14 instead of day 15.
According to David Tarpy's research at NCSU the larger queens are the best queens! larger queens mate with more drones, and the queens that mated with the most drones gave off the strongest pheromone and were treated with more respect/care by the bees... Larger queens have more storage ability in their spermatheca, etc etc... Interesting research if you get a chance to read it!