How did it go by removing the RAM? I have the same issue and been trying many solutions (BIOS, chipset driver, armoury crate services...)without any success. Have you tried uninstalling the CPU driver as someone said on the other thread? Think i'm gonna try that next.
Just in case, you can reduce the throttling by activating the ryzen balanced Power Plan, because it sets the CPU freqs to 2.3 Ghz, without boosting. Therefore, performance is thrash but stable.
Let me know if you have any updates.