I am wanting to smoke a Prime Rib for Mother's Day. This will be my first time doing so with the Egg. We will be preparing 2 separate roasts at the same time -- both weighing approx. 4.5 - 5 lbs each. The book says we should allow 22 mintues per pound if we cook it at 300 degrees for a desired center temperature of 175 degrees. MY QUESTION IS THIS: with the TOTAL weight being almost 10 pounds, should we guage our cooking time on the individual weights of the two roasts or the combined weight of the two roasts? (4.5 lbs vs 9 lbs makes a BIG difference...LOL) Thank you in advance for your advice.