I think the take away from your specs is that your CPU is running 1.3GHz faster than mine. I don't believe there is a significant IPC gain from Haswell to Skylake, so I'd say That I need to get somewhere close to 4GHz to reach a solid 100%.
Will have to check if my BIOS still supports OC'ing as Intel pushed manufacturers to kill OC'ing in non K CPUs. Even if it's possible, Intel may push a microcode update through Windows Update at some point and spoil the fun. Never ventured into OC'ing before, so new territory for me. Definitely have the thermal headroom to play with.