Radeon Vega 64 instantly crashing under high load

Hi!

I just upgraded to a vega 64 (sapphire 8 gb reference edition) from my 980 ti, to run mojave and overall have better performance in macOS, however I'm running into problems.
I managed to get dual monitor working with lilu and whatevergreen, and even managed to stop my fans from simulating a helicopter with vgtab, no matter what I setup in vgtab in terms of the higher p clocks, and power target (tried between 40% and 100%) as soon as I start valley or heaven my pc just shuts down. On windows i can run both of them without problem, so it's not a PSU issue as I originaly thought.

The only progress I managed to "make" was by using RadeonVegaLowFansSpeed.kext which allowed me to run geekbench without crashing, but still crashes at valley/heaven.

I was mostly experimenting with just using the vgtab kext in kexts/other, initially I tried it with SSDT, and injecting it into the config.plist, but none of them seemed to make any difference, should I continue experimenting with those too or it should work as a kext too?

Here is my current EFI: https://drive.google.com/file/d/1vhaEOTPVc4QTl5ZF_Y3f7FcQ-CzHsU8Z/view?usp=sharing

Setup:
msi x99a sli plus
i7 5820k
sapphire amd radeon vega 64 8 gb
mojave 10.4.4

Anyone got any idea how can I make it run propely?

Thanks,

sieer

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