I have powerlevels set to 90,80,70,60 and mm has been benchmarking power 90 for over 10 hours. I see the stat files for the 1060 and 1070 (26 for each). Not sure why it's stuck on 90. I did start as Administrator.
*First all maximum power level will be benchmarked for all algos (90 for you).
*After that when a miner/algo will be running one interval as more profitable, others power limits for that combo will be benchmarked.
This avoid test all miners/algo combos on all power limits, only best are tested on other power limits than maximum.