I think a few more cooks/smokes will iron out any user error and kinks with the system. Worst case scenario I would just run autotune each time to get it up to temp. Autotune doesn't seem to have a problem lol.I believe one person mentioned that they reset their pid so it was back to the out of the box default settings with better luck and didn't autotune. Proportional=past values, integral=current values and derivitive=future anticipated values yet to come based on the p and i. I don't know how long it takes for the d values to learn and minimize cycles. Strange that the circuit doesn't stay closed to reach your desired temp. Someone with a pid could be more helpful on how quickly the process takes.