@shilohh, do you remember which OpenCore version you used for the USB? I'm getting a Schema Error that's not making sense. I did everything you said to the tee, replaced OCs USB directory with the one you provided. I am using same hardware as you except I'm using onboard graphics for now until I get OSX installed. I've doing it this way has always been easier.
This is the error I am getting:
OCABC:
incompatible OpenRuntime r11,
require r12 Halting on critical error
I used the .067 OC version BTW same one that is in your download.