Way back in the early days of pellet pits, temperature swings were @ or near the top topics we discussed - no more mainly due to better controllers.
The following quote from Thermoworks touches on this very subject with the introduction of the Dot Square that displays an "average" temperature.
When you set your oven to 350°F, it could actually heat much higher, by as much as 20 degrees or more. This temperature difference means your food will likely end up overcooked on the outside while underdone in the middle.
Verify your oven’s ACTUAL internal temperature with Square DOT and its revolutionary Average Mode.
