I recently purchased a large Vision Kamado off of Craigslist. Sorry no good stories of the purchase. I have used it 5-6 times so far and am really pleased with the grill. I am having trouble getting the grill over about 250. I open up the bottom vent all the way, and the top vent all the way and it still peaks at about 200-250. I have no idea how folks get their grill up to 600 or so to cook a pizza. Last night I opened up the bottom vent and used a magazine to fan air into the bottom vent. It got up to about 225 and held. What am I doing wrong?