To be fair mate 40fps minimum in an online match is fairly decent IMO.
Yup I'm seeing the usage , the issue here is that if you look around you'll see i5 skylake chips (even overclocked 6600k's) suffering the same 100% usage % 60-70% GPU usage.
Its more of a game issue than a CPU issue , I'd expect it to get patched out 'eventually'
If you're happy with fps but just want to see more gpu usage then up the graphics settings a bit.
I would argue that a 1060 is a little too much gpu for the 860k.
You should be looking at the 1050ti now it's available