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The ignorance of any set boot priority is a very common issue with OZ and some Bios Revisions. You may try the F10 revision as well since the F10 revisions of Gigabytes Z77/H77 Boards are known to work as intended (working NVRAM). The Sleep issues may need some DSDT tweaking as well as some further Informations eg. WakeReason and stuff like that...

No it's almost because NVRAM in this Bios Version does not work as it is expected to work that's all...In a normal Initialisation Sequence OZ will show it's own Bootsplash (OZ Logo) on first boot after successful flash and will then beginn to scan your drive structure and add it's boot Entries according to what it finds on your drives. This information is stored into NVRAM (as the bios Settings are as well) and you should be good to go. For some reason this does not work with all Bios revisions …

Well APFS and OZ do not play well together (at least not right now). Even if APFS is present in your ROM OZ will not be able to autodetect APFS Volumes and add Boot entries for them on it's own. As long as the macOS auto generated boot entry is present (eg set by SystemPreferences -> BootUp Volume) everything will work as expected as long as NVRAM does work as expected. If not you're pretty much lost since OZ is blind for APFS based installations in this case you may try to add an entry via EFI …

Hum if installed on HFS it should boot on it's own if the disk which macOS is installed on is the first in the chain. If you do not select any boot device is the PC complaining about a missing OS or does it start anything else than macOS or does the screen stay all black ?!?