Oh - definitely don't turn the SC element back on.
Have you improved the stirring arm yet? Most folks do something as simple as adding coat hanger wire to more elaborate stirring fins. In any case, it is my understanding that larger stirring arms that extend towards the perimeter of the SC greatly assist in creating a more even roast.
If you haven't done that yet I'd love to see what you come up with & hear your results!
Right, my goal in the near future is to improve the stirring. Seems to be plenty of air flow and heat. Thanks.