Want to make Utimate coconut cake that Bobby Flay won against renowned chef Robert Carter (Peninsula Grill) for my daughters birthday this weekend. The issue is- that the recipe I found is for 8 servings using 2, 9" round by 2" high cake pans. I have purchased 1, 9" by 13" by 4" high sheet pan specifically for this recipe and have no clue how much I have to increase the recipe. Also- this is NOT my first time baking (although first time taking on a feat like this) and know that far too many times when you merely double a recipe- IT NEVER COMES OUT THE SAME. How should I go about doing this-NO TIME FOR A TRIAL RUN. Assuming that my pan requires the recipe to be doubled (IF THATS ENOUGH)-How should I do this? Can the batter sit while I make the second batch (referring to the cake batter) or if I double it-are there any changes I should make to avoid the age-old dilemma of it not tasting the same when you double a recipe. HELP!!!!!!