Also, after removing the stock water pan, in my PB5 I get good results by using one of the grates to hold the disposable foil pan, but move it up to the 3rd set of holes from the bottom. This gives a little more air volume for the fire pot to heat and seems to hold the swings down a little bit more. Should work for the LG7 as well.
Just remember the display pit temp is the area under the water/foil pan, not the cooking chamber temps. So where the food is, you are not going to see those swings. The swing is due to the inrush of heat from burning pellets and the fall is from where the auger stops, but the result is fairly smooth temps in the food cooking area.
I also took my logo off the glass door and inserted a Tel Tru thermometer. That and remote pit temp probes on the various racks confirm the swing is much less (almost none at some temps) in the food chamber.
Just remember the display pit temp is the area under the water/foil pan, not the cooking chamber temps. So where the food is, you are not going to see those swings. The swing is due to the inrush of heat from burning pellets and the fall is from where the auger stops, but the result is fairly smooth temps in the food cooking area.
I also took my logo off the glass door and inserted a Tel Tru thermometer. That and remote pit temp probes on the various racks confirm the swing is much less (almost none at some temps) in the food chamber.