you need the correct port limit applied in the config.plist together with the correct usb kext.
Please follow the fixes available from gigabyte 300 series MoBo thread, please check the thread completely.
If none of the fixes working for you, pleas report your issue (with complete EFI folder...
"Still waiting for root device".
Intel USBs need fix in 300 series MoBos. Try with the below Usb kext in USB Installer EFI (full path in quote).
https://bitbucket.org/RehabMan/os-x-usb-inject-all/downloads/RehabMan-USBInjectAll-2018-0420.zip
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