So I am a BGE newbie, but have smoked a few boston butts with great success. However, it is hit or miss grilling. Specifically, I am having trouble getting my BGE up to temp (500-600 degrees) for burgers or steaks. Sometimes it works, but usually not. I'm trying to cook burgers now and the darn thing won't get over 300 degrees. I did not clear out the charcoal, but did add some fresh. The old charcoal wasn't only used once. Also, I made sure the air holes weren't clogged and there is very little ash in the bottom. I use an electric starter and leave it in for about 15 mins. It has been at least 30 mins since I took the starter out and the temp is stuck around 275. Oh, the bottom vent is wide open and the top vent is uncovered. Ideas?