Cannot get through USB Installer

Hey there.
I'm doing a fresh Opencore install on a custom built desktop previously running a clover install.
I can get into the USB and start the installer but it gets stuck on the same line each time. Eventually it starts garbling the text on screen and displays some kind of Apple error message. I've combed through the Dortania guide, double checking the whole config.plist setup and relevant kexts/SSDTs. I am using only prebuilt SSDTs.
Would love any help or pointers. Can upload EFI here if there is a way to do that. Thanks.

Error it stops on:
[ACHI][HBA][00170000] start::512:Successfully initialized ACHI controller

Machine:
i7 8700k (Coffee Lake)
Z370 Aorus Ultra Gaming Wifi MB (Gigabyte)
Radeon RX 6800 (AMD)

submitted by /u/BigBearBoiB
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