I haven't used adaptive voltage but on Youtube you could find plenty of videos guiding you to the optimal settings for overclock of i7-6700K. As far as I remember, one of the guys recommended to manually fix the voltage at 1.345 V to achieve stable 4.6 Ghz for your CPU (higher than your current clock). With a good cooler you shouldn't worry too much about this voltage level (the maximum allowed by Intel is 1.52 V but this is too extreme).
In the worst case, BIOS flashback is also an option.
Personally, I am too lazy and have simply increased the multiplier of my i5-6600K from 39 to 44 without touching the voltages at all. I let the MB to decide about it; they are usually in the range of 1.26 with momentary peaks of 1.3 V. Actually, I was able to achieve 4.5 GHz too but not all games appreciate it (I managed to play through Assassin's Creed: Syndicate and Fallout 4 without issues but Civ 6 crashes after an hour of gameplay). Oh, and I also run with BIOS 3007 on the same MB.
