I built a UDS this spring and it started out with just a top grate 7" from the top. I put a second rack on it recently about 7" below that one. My thermometer is directly in between the 2 grates. My issue is the food on the bottom grate gets charred if you don't rotate the racks. My question is, if I put a deflector on top of the fire box will that eliminate the issue or will I just have to keep rotating? Since my fire box is round (technically not a box then I guess) I thought about putting a pizza pan with holes in it on top of it. What is everyone's thoughts and is there a fix anyone knows of? Thanks!