Well I gave it another shot, I lit one piece of lump and set the target temp on the IQ to 200 to bring it up slow. Where do you put the thermometer probes? I have them in the center, could I be getting a false reading because it is right over the flame? I have a diffuser (pizza pan) in place. I am currently at 289, 291. With the top vent at a setting of one. I have not touched the IQ it is still set at 200 with a damper setting of 1. I am about to call them and talk about refunds..... Just hit 297 while typing this. 298. Getting frustrated. Just hit 300 a full 100 degrees over the setting that I wanted to achieve.