I know it all boils down to how you look that morning.
I think the safest route is to not change the diet so drastically, especially if you are looking great already.
As for backstage, its trial and error. Some people do really well on fats and some on sugars and some both.
My husband said Potato Chips worked great for him backstage.
Other choices - Rice Cakes with pb, rice cakes with jelly, almonds, plain organic PB alone, jelly beans , ...