If you have meat on all 4 racks, where do you put the amns? I takeout the cylindrical chip loader to give it more air and open the vent 1/2 - 3/4 of the way. Then I place it on the bottom. Quite often I don't get enough smoke. When I only have meat on 3 racks, I use the bottom rack to place the amns on. Then it works fine. What do you suggest?