I purchased a big bag of Mesquite and Hickory chunks @ Walmart and cannot get it to smoke. The wood I've bought at my grill supplier always smoked well. I even upped the temp today before putting the meat on to 350* and it still barely put out a wisp. I'm using a gas GOSM with an iron pan to hold the wood and have tried soaking and not soaking the wood. Anybody else run into this?