I read about EMU Variable as well on Insanely mac. Aptio Fix 2 had similar issues. I was using 2000 at the beginning of the year, but started having issues (around the release of 10.14.4).
Crap -Just downloaded my zip file from my thread (Not at home this week). Looks like at the end of May I switched to using EMU + Fix3. I've made so many changes to get this system stable that I get confused on the last thing I did, lol. It all started when I decided to try and eliminate all the Clover options and drivers that I could. I'll double check this when I get home this weekend. I'll update my thread to match which ever method is working right.
@morganb : My fault with that advice. You are also on Z370 which is a bit more different than I thought. Have you gotten your sleep issues resolved yet?