@Minstadave
What CB 20 score do you currently get?
Which bios version?
What are your core temps and speeds during CB20 run?
What core voltages?
XFR and PBO settings?
Any manual settings entered for PPT etc?
From my testing memory tuning has very little affect with CB20 its all about your core speeds.
If you have had any Bios problems which I did a few times after reaching too far with overclocking (even to the point of not booting)
I found the only way to prevent them continuing to affect things is to flash the Taichi by using a USB stick in the bios flash usb port.
This is the only way to overwrite EVERYTIHNG to ensure all is as it should be.
Doing it this way erases any saved profiles because a lot of people seem to have issues trying to use previous saves on a new version bios.
Things can then get screwy and the problems will persist.
If you use the normal flash process from within the bios it does NOT erase the previous bios saves.
This file is a CB20 run of mine showing cores 0 and 1 doing the majority of the processing.
https://1drv.ms/u/s!ArMHGD-yylU7gdsUgQ81XO2sm_bnrg?e=Qwp4Qg
You can see the history of my single core CB20 runs and I started at 420 which I was horrified at after seeing other peoples scores.
My current best CB20 SC is 544 but that setting is not my daily driver and I do not think it will be beaten by a 3900X at least.