I know it is not about processor, its about game...i monitor all my games all the time and the only problem is bf1, i highly doubt that you have 60-70% maybe on Sinai but all other maps, no.
The things i have tried were
gametime.maxvariablefps 75
RenderDevice.RenderAheadLimit 1
turning resolution up and down as well as other video settings
clean boot
issue is still there
i posted this problem on google+ group and many replied that they have same issue even with i5 6600k where they had 100% usage, i doubt we are all wrong