When I first received my Cookshack, and as a newbie, I spent a majority of my first smoke fooling with the thermostat. My thermometer would rise, drop and rise again. So I would raise and lower the thermostat accordingly.
Called CS. They were concerned and very helpful. After a brief discussion, they determined that everything was normal but not to hesitate to call back if i was not happy with the end result.
I left the thing alone for the remainder of the smoke. Meanwhile, I entered the forum to kill some time while the smoker was puffin away. There it was...all the talk about temperature swings. Conclusion...forget about it. Relax and enjoy the smoker.
I have learned over the past year that the temp swings are nothing to worry about. It will do it's thing just fine. In fact, unless you need to monitor the temp of the meat, don't even use a thermometer for the smoker temp.