RE Controller: For the price and excellent performance why not go with the made in USA Ortech. Has a shut down cycle, fits in the hole, comes with an RTD and plugs into the existing wiring. Ortech designed and manufactured the original digital controller for Traeger. Later Traeger sourced their controllers from China.
On high setting the auger rotation is constant so it won't effect max temps. The Ortech does have a high temp warning. It is 650º!
So, with respect to your "Has a shut down cycle..." statement, does that mean the hot rod turns off, but fan keeps going for a while? If so, I'm definitely going with a new Ortech controller! That's a new controller and fan mod in one!!!
On an unrelated note, I picked up a cover the other day...
Yes, it's not made for a Traeger, but for just over $23, I couldn't pass it up...and it fits pretty darned good!