I'm going to be brewing a higher gravity ale than I've tried before (OG 1.088), and plan to use a starter. When I used the calculator on the Mr. Malty site, it said to use 2 yeast packets, but a friend of mine says I really only need one. According to the calculator for 5 gallons at 1.088, I need 299 billion cells, or 2 vials/packs in a 2 liter starter. Am I wasting money by going with 2 packs?