I will start by saying temperature controls how far you can overclock your cpu. I see you have the corsair h100i cpu cooler which is a great cooler.
Download these three programs: ROG Realbench, Real temp 3.70 and cpu-z. When you get these installed post back here and we will begin overclocking your cpu. Sound good?
Could you please use ROG realbench? It is much easier on your cpu and does not run it near as hot when stress testing. It is a great program, it's what I use. You will get the most out of overclocking your cpu using realbench.