I am on my inaugural smoke with an AMNPS. Using a MES30. Tray lit fine and using pellets. Tray is on top of the inverted water pan, on left side, not over elements. I have the top wide open, and the smoke tub only about 1 inch out. I started with nice thin smoke, but now at full smoker temp (275), the smoke coming out is darker and billowing. Is this too much air? I don't want to open the door to look at the tray for obvious reasons. HELP!