3200mhz B Die no longer stable on X370 Taichi

I'm using Samsung B Die F4-3200C14D-32GTZR (which is on AMD support list here) 2 x 16GB sticks. I don't believe it's on Asrock QVL, but since this is B Die it should work. When I had my 1700X, I would load the XMP profile and it would be 100% stable at CPU stock speed or a moderate 3.8ghz overclock. It ran the RAM at 3200mhz 14-14-14-34, 1.35v RAM voltage, 1.1v VDDR_SOC voltage.

After upgrading to the 2700X, I can only hit 2933mhz RAM.  If I load XMP profile for 3200mhz (again it defaults VDDR_SOC to 1.1v, but I've tried everything between 0.925v - 1.1875v) the system usually fails to POST and will bootloop on 9F or hang on 0d.  If I'm lucky and it POSTs it will freeze pretty quickly. If I back down to 2933mhz (I even put the RAM from 1.35v -> 1.3v) it's rock solid stable. When it's at 2933mhz the VDDR_SOC is running at 0.925V which means my IMC/ integrated memory controller on the CPU can't be that bad....  I put the RAM in a friends Z370 system and it ran HCI memtest to 400% on the XMP settings overnight, so the RAM is good too.

I've tried BIOS 4.60 and 4.70 and the BETAs 4.64 and 4.72.  By the way, BIOS 4.72 seems the best out of any of them even if it's BETA so if you have the X370 Taichi I strongly recommend that. Even on my 1700X it fixed some quirks like voltage not being applied right and the multiplier bug.  Please help!

VDDR_SOC is basically the CPU IMC voltage.  How can I be running 2933mhz at 0.925v, but 3200mhz is unstable regardless of VDDR_SOC?  That doesn't make sense... It should scale to a certain point.  If I had a poor IMC on the CPU, then I would not be hitting 2933mhz at such a low voltage.

Ryzen Refresh should have better IMC than first gen.  On my 1700X I could even run 3333mhz on this same dual rank kit.  There's no reason it shouldn't work at 3200mhz on the 2700X.  And that link I posted was from AMD- this RAM is approved for use on Ryzen at rated speed timings regardless if Asrock has it on their QVL.  QVL can help when purchasing RAM, but isn't the end all for compatibility by any means.