HI,
few days back i was talking about audio problem through display audio port in clover bootloader. What i i did was i reinstalled my entire os after deleting and reformatting my M2 SSD and installed ozmosis 167x xmas bootloader and booted high sierra it was absolutely fine and surprisingly my display audio worked and it was stable also. i copied lilu and hdmi audio kext in ozm folder.
Thanks
nrchandar0100