@Thireus, I think it might help to clarify the following:
I am running my build on a 24/7/365 base, i.e. I never turn it off. Everything works flawless and I never face any issues, KP or freezes. I also totally disabled any Sleep/Wake functionality, as Sleep/Wake still does not work flawless since 10.13.2.
Thus, the issues with the Rampage VI indeed might be build related. There might still remain some issues with your BIOS settings, especially with respect to OC. I recommend to further tune your AVX and Core Voltage settings and to stay with stock speeds until your system is rock solid.
It might be also necessary to further tune the Clover settings for this latter board, although I think the issues are rather related to the BIOS settings.
In any case, please let me know if I can help with further ideas or anything else that would help in solving your issues with the Rampage VI.
All the best,
KGP