I have heard many good and many bad reviews on the MES30" here. There also seems to be several ways to run this smoker. I just have a few questions about improving my results. 1. should I put sand or water in the water pan? 2. Should I run it with the air vent open,closed,or other?? 3. should I trust the temp probe at all? 4. Do I NEED one of them AMNPS thingys or will I be fine without??