Undervolting Through Hex Editor- SimpleMining

Due to recent events I have decided to forego bashing my head against the wall with windows 10- My alternative being the Linux based SimpleMining OS.

So far I am a huge fan of it. One (huge) weakpoint is that undervolting just doesn't work on it for reasons that I at one time had read but have now forgotten. Because of this, I am forced to deactivate one of my GPUs or exceed my 1200W PSUs capacity.

I have searched around for the past few days now and have found a few posts/tutorials on editing the BIOS in a hex editor that touched on the subject, some more than others, but none were comprehensive enough to strictly cover undervolting.

I've gotten as far as finding the 'VoltageObjectInfo' section of my bios and adding the voltage offset register(8D 00)using ATOM Bios reader and HxD/HexWorkshop, but past that I am stuck as far as what to do as far as adding something to bring my voltages down to the 900 mV for the core and clock that worked for me through Wattool when I was on windows.

Can anyone give me a hand?

Tutorials I've found useful so far-

Anorak Tech AMD VBIOS Hex Modification Tutorial

Adding VDDC offset to Fury X ROM