Base steps were I created a new image in GPT format.
Afterwards, on the FOG server itself I edited the config file located at /var/www/fog/service/ipxe/refind.conf
Below are what I have the values at. This was after some troubleshooting so some may be back to their default values.
scanfor internal,external (I also have both lines commented out at the moment)
uefi_deep_legacy_scan is uncommented
From my memory that is all that is changed. After the imaging is completed in UEFI, it will boot straight to the OS instead of pushing itself through FOG and/or rEFInd.
Hope this works for you!