OK, my fellow CCers, I am attempting my first use of my sporst ball pan and would like to ask, should I use a flower nail in the middle?? Also, I've seen on another post to cook it at a lower temp, is 325 OK? And last but not least, should I fill it almost to the top for a symetrical look???? Help!

I don't use flower nails and they come out okay. I always bake my cakes at 325.