ALC 1220 Audio Crackling Issue - No luck! (Z370n Wifi - i7 8700K)

Hello Hackintosh community! Before you read any further please note that I have spent 3 nights trying to be a big boy and fix this issue myself, but I am now at my wit's end! Your help would be greatly appreciated as I hope to give back and put together my own guide once this is 100% running :)

Issue: Audio crackles at certain volumes. Slight distortion heard at all volumes.

Hardware: Z370n Wifi - i7 8700K - AMD RX570 8GB - 32 GB DDR4 3000 etc. etc.

Type of installation: Vanilla Installation

SMBIOS: iMac 18,3

Current KEXTs:

AppleALC.kext
CodecCommander.kext
FakeSMC.kext
IntelGraphicsFixup.kext
IntelMausiEthernet.kext
Lilu.kext
SmallTreeIntel82576.kext
USBInjectAll.kext
XHCI-300-series-injector.kext

Steps taken to troubleshoot:

1) Tried modifying Devices -> Audio -> Inject 1 / 2 / 5 / 7 / 11 /13 (all of them crackle)

2) Audio MIDI setup (no luck)

3) ??

Config.plst can be uploaded or pasted for review.

Any ideas if there's something else that I can try? I could go the USB audio route, but I'm determined to get this fully working!

Thank you all in advance for your help!

submitted by /u/19E92
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