Into my second attempt with my Masterbuilt Vertical Propane Smokehouse. The first attempt some weeks ago was pretty much a disaster. Billowing smoke, wood that burned instead of smoked, so I started searching for help and wound up on SMF. After modifications (bought an 8" skillet for the wood chunks, purchased a dual probe thermometer, installed a gasket on the door, elevated the manufacturer's wood tray, placed the skillet on top of the tray) I'm into my first attempt with a Boston butt. But, alas, no smoke. So, I've lowered the tray back down and still no smoke. Any suggestions? I'm holding a good temp between 225 and 230 or so. Thanks for any advice.