Hi I got myself a Master built gas smoker prepped it with door seal & Lava rocks. Haven't been able to figure out proper temperature setting yet. Few newbie questions:- 1) How far off is Inbuilt temp gauge ? 2) First time I did Baby back ribs they were done in less than three hours (seems like my temp setting was too high??) 3) Today just when I thought I found setting to keep temp at 300 (assuming that it'll be off by at least 25%) & left it for couple of hours the ribs turned out burnt. Note: I did buy a Charboil multi sensor thermometer upon testing I found out that it's giving me wrong readings. Hence I did not use it for my last try. Any suggestions are much appreciated.