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Sounds like you are having similar issues to mine on the same motherboard. I was having a load of memory errors at stock on my Corsair 3200 kit. I had originally set XMP and manually set memory voltage to 1.35 as per spec. This just didn't work. Ended up using the same beta bios you have and reset bios and entered things manually from the Ryzen DRAM calculator. Did eventually get stable at stock but no higher. Seems like the auto settings just aren't right.
That SOC voltage of 1.5 sounds a bit on the high side too!
That SOC voltage of 1.5 sounds a bit on the high side too!