I was about to give up after I had reverted back to Sandy and ME7 again (reference link), but wasn't really all that happy with the v18.7 results. v18.8 or any of the Sandy Beta's were not performing as well as I thoughht they should. Gave this v19.2B1 Ivy Beta a chance. Glad I did!
https://forum-en.msi.com/index.php?topic=162713.0
As a side note, when using the forum flasher and mode 1, it would not accept the file. I had to unpack it and use mode 2. One thing that was missing doing it this way was probably the file that said VALCHECK wasn't included on the USB stick? Was it necessary it should have been? Putting it on the prepped USB stick and reflashing required? As the original vJ0 did, does this Beta also update the secondary chip?