@rednow, what are the default values with your mod? Can you share an overdriventool screenshot too 
?
My reg-file mod is based on vega54 liquid bios. ? Only changes are to set "greyed" low power state voltages to 900mV (905 or 910 if you are a silicon lottery loser) and increase SoC clock to 1200.
All other settings are done in OverdriveNtool as I wrote before.
I didn't touch gpu or mem clocks in power play at all.
Took a look at your reg file and the offsets are completely different from what most are using. On my Vega64 it works like a charm with the SoC overclock while still keeping VDDC under 950mv, never seen that before
On my vega56's flashed to 64 bioses it doesnt work at all. The offsets are all wrong and they will immediately crash at any Mhz/VDDC combination. Interesting, it's the exact same bios but they still act differently
http://i64.tinypic.com/mijjn.jpg
Still hates it. The vega 64 works fine with air bios.