Ok - my board is the GA-Z87X-OC FORCE (same chipset as yours) and the newest/latest BIOS is F10b. Now I don't know if there would be a difference for your board but it's worth checking out on Gigabyte's official website. Running an SSDT solely hmmmm without a DSDT, strange - maybe try removing the SSDT and let the system run it's Generic DSDT and SSDT and see what happens until you can generate proper ones to get a stable running system.
Have a read of this! Since I built this rig I have not used a DSDT...
The 10c Update you mention is a beta.... it's also not available through the bios app directly via the server... You're right our boards are very similar... I had the choice here,,, your is better for gaming...
That said.... I have basically reinstalled HS once more and this time what I did was clean install Clover and copy across my SSDT and XOCI amls... and kexts I use - What I discovered though is that there was a DSDT and and a HDMI DSDT in my original folder... How the %&/$ they got there is anybody's guess... I think maybe this clover folder was either edited by someone else or it was one I downloaded initially to get HS up and running.... EIther way they ain't there now!!! I have no idea if it was that alien DSDT that may have thrown the spanner but one way or another we'll know if this was the issue or not by this time tomorrow! =)
I generated a new SSDT btw using the PikerAlpha Script,,, Usually do this by other means,,,,
So far it's Hunky Dory,,,, as usual but after a few reboots,,,,? Keep an eye on the thread... I'll let u know!