Guys, I'm new here and to smoking. In fact, I'm smoking my first rack of ribs right now. Here's my problem, I can't seem to keep the temperature on the outside thermometer stable. I have three settings; Warm, Ideal and Hot. When it gets below 'Ideal' I throw in a little charcoal or mesquite then it jumps back up....it just went up to 'Hot' about 10 minutes ago and now its between 'Warm' and 'Ideal'. What am I doing wrong here?