First off this thing is great, totally changed my MES 30. The last few times I've used the pellet tray it has lit the second row after a half hour or so. Today I made damn sure I didn't over fill the rows, pellets where maybe 1/4-1/2 inch below the top of the tray and I went out to check it after an hour and smoke was pouring out the vent. Looked at it and the middle of second row was smoldering. I keep the tray covered with a foil pan, top vent 3/4 open and chip tube is out maybe a couple of inches. Only the first row is lit when I put it in the smoker. Any tips??