I actually thought I read someone else say they tried stock V56 bios with the V64 power play table and it worked for them before I initially tried it and I didn't realize there was any risk! guess I got lucky that I didn't brick my 2 cards and that it works so well. I am trying a power play table specifically for V56 now to see if anything is different results wise
Interesting, first time I played with powertables I get the opposite: tried one for Vega56 in my 56 with 64bios and totally crashed on windows start.Now with vega64 powertable only crash sometimes

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My best hrate/power is about 1800 about 140w. 1267core 1050mem, voltage set to manual.
How much vega 56 in your country ? and is available ? .
It cost me 436 shipping included on launch promo. Still available in many shops here but cheapest place I found in europe at this moment is 519,95.Just check big retailers frequently, Im sure they will be on promo again soon.
Edit: just saw this.Afterburner adds full support for Vega OC and voltage control.this is getting interesting
https://www.reddit.com/r/Amd/comments/75a4t7/msi_afterburner_440_beta_19_released_with_vega/