OC'ing Ryzen 1600X: Voltage stays the same, no matter the value

I need some help on OC'ing my cpu

 

I have somewhat successfully oc my cpu to 4.0Ghz, but I can't seem to get the volt to where I want it.

 

I've tried using offsett mode, both negative and positive, and the volt stays exactly the same no matter what value I put it at.

The volt shows in Ai Suite and HWInfo is fluctuating  between 1.381 - 1.401.

I have read that alot of people are getting a stable OC at around 1.337 - 1.375. This is where I want to be at.

 

I tried to put in a value in manual mode, but doing that gives me 2.2ghz instead. I have read that this is somewhat "normal" ?

 

I've followed this video from Asus when I did my OC: https://www.youtube.com/watch?v=pBmVf0S4UDs

 

I have tried different LLC states and I have turned off Core Performance boost.

 

I don't know what to do. Any help will be highly appreciated.

 

Thank you

 

Specs:

CPU: AMD Ryzen 5 1600X

M/B: ASUS Prime X370-Pro (Latest Bios)

GPU: ASUS GeForce GTX 1080 ROG Strix Gaming

RAM: Corsair Vengeance LED DDR4 3200MHz 16GB CMU16GX4M2C3200C16R (Only using 3066MHz as my PC wont boot to Win if I go higher)

PSU: EVGA BQ 750W Hybrid Modular 80+ PSU

SSD: Corsair Force MP500 240GB M.2 PCIe SSD 3000/2400MB/s read/write

SSD: WD Blue 500GB 2.5" SSD SATA 3.0 545/525Mb/s read/write (using this drive dedicated to games only)

O/S: Win10 Home 64Bit