^ Your CPU 1.296v stock idle is 1.296v under load too Jack?

1.296v is stock Vdd supply for 9850 BE, vdroop is different on boards, some overshoot, some under, some you can disable [not recommended] -- TDP is decided by vdroop Vdd supply, as will stability at a fixed current.

Also, please test with some uptime - preferably 10-15 hours minimum with something light running, such as "stability tester" which runs Pi looped on any number of cores you decided. I'd like to see if you get any idle freezing at high MHz because many of us are benching 3G 1.296-1.350v but cannot get this daily stable at all.