your limit is the cooler as that mobo in your hands is a killer overclocker. One of its top of the line boards from Asus for clocking.
in my opinion:
1| get a pair of good fans to hook onto the cooler and maybe you can see a few MHZ rise in clocking.
2| with that 4.0Ghz clock that takes you to 85C, try gaming in that setup and see how your temps fair.
3| investing in a watercooling loop would be a good idea to keep your temps in line and no I don't mean a Hxxx unit - I mean a real watercooling loop.
4| You didn't mentionanything about the case that you run
5| Usually having too much TIM between cooler and IHS works negatively as there is thermal lag due to the compound, so might want to check if you put on a lil more TIM than needed.
6| those volts look kinda high - though It could be me