Thanks!
I indeed see some mistakes:
SSDT-EC-USB not adjusted to the actual LPBC path (\_SB.PC00.LPC0).
SSDT-RTC0-RANGE is needed, and adjusted for the proper path, but it lacks the part which disables the native RTC.
Only one of HfsPlus.efi and OpenHfsPlus.efi is needed.
Missing keys in bootlog. I suppose you put OpenCore 0.8.2-DEBUG on an earlier version and forgot to apply all changes in config.plist.
00:000 00:000 OCS: Missing key CustomPciSerialDevice, context <Quirks>!
00:000 00:000 OCS: Missing key ForceAquantiaEthernet, context <Quirks>!
00:000 00:000 OCS: No schema for SerialInit at 5 index, context <Debug>!
00:000 00:000 OCS: Missing key LogModules, context <Debug>!
00:000 00:000 OCS: No schema for AllowNvramReset at 0 index, context <Security>!
00:000 00:000 OCS: No schema for AllowToggleSip at 2 index, context <Security>!
00:000 00:000 OCS: Missing key Serial, context <Misc>!
Further observations:
I took the opportunity to make SSDT-SBUS-MCHC (SBUS device found at address 0x001F0004) and SSDT-PMC for native NVRAM (same as for Z390).
SSDT-UNC should not be necessary for Skylake and above.
Good news from the bootlog:
44:468 00:069 OCABC: All slides are usable! You can disable ProvideCustomSlide!
AppleCpuPmCfgLock is for earlier architecture. AppleXcpmCfgLock and AppleXcpmExtraMsrs should do.
Your workstation has a a DMAR device, as expected for this class of system. DisableIoMapper is probably not necessary: AppleVTD should work fine.
XhciPortLimit does not work with 11.3. If you're trying with 11.0 to 11.2.1 it's fine.
I copied your settings into a proper version 0.8.2 Sample.list, with the above changes. Please double check, add your serial numbers and rename to config.plist.
You may need to put back CpuTscSync.kext (I saw it was disabled in your config.plist: Leftover from an earlier test?) and to add boot-arg
npci=0x2000 (usually needed with Xeon W/Scalable; the symptom is a brutal stop shortly after PCI initialisation).