Curious, can you run these memory settings at full pot temp? On old bios, I had to run pyprime at -160 and just ran 7.7-7.8, but now going all the way cold is easy.
You can just mod the bios to use the older microcode that supports it.Here is one from latest bios
Alternatively, you can use an EVC or other spi flasher to force flash the older bios, that worked for me.