Last night I tried pizza on the grill for the first time. It did not go well. I start with roughly 40 briquettes in my chimney starter. (I would have used more but that was all I had at the time. I figured it would be plenty to cook a pizza.) When they were ready I spread them evenly on my bottom grate from the center out. I put the top grate on and then the pizza stone and closed the lid to preheat the stone. The bottom vent was petty much wide open and the top about 3/4 open. For whatever reason I couldn't get the temp higher than 325. I waited a little white and put the pizza on and closed the lid. 5 minutes later I checked on it and could tell that it need more time because the top part of the crust appeared really raw and the cheese wasn't completely melted. So I closed the lid and waited some more. Long story short, I couldn't get the top of this pizza cooked and the bottom of the pizza turned out burned to a crisp. Please help me out if you can.