I know there's likely a post covering this, but I must be doing something wrong. I've used my BGE three times. I haven't be able to control the temp well and appear to be using a lot of lump. I use an electric starter with about a 3 to 4 inch high pile of lump covering the entire bottom of the firebox, and both the vents fully open. After reaching a temp of 250-300, I close the bottom vent to about 1 to 2 inches. The temp fluctuates wildly, and unless I use about twice the amount of lump, I cannot reach temps of 500+. Also, I have used all of the lump in the BGE, and I've refilled it for each use (I do close off both vents when I remove the food). Please Help!