King tut is foxtailing, I had two hours where the temps got to 90 in the tent three days in a row. I've seen some others mention foxtailing on king tut in general.
With the ROI-E680 a few people complained about foxtailing on the first couple grows. I turned the light down to 60% from 80 and the dehumidifier set on low so it would stop spiking the tent temp and keep the humidity in the 50s as best I can.
Fingers crossed!