@TechnoBabble28, I don't think you disabled the correct setting. You do not want to adjust C6, as it will make the problem worse. Leave it at Auto. Instead, you need to disable "Global C-state Control", which is typically located here:
Advanced --> AMD CBS --> Zen Common Options --> Global C-state Control
Tom, sorry I'm not going to try 6.7.0-RC1, I need stability in my life right now.
Paul