Default Volume settings aren't working

I had a stable setup up until December, when I found that Default boot options in Clover's config no longer worked. Linked is my config.plist, the hex code I'm using is the ID I got from Clover Configurator converted to little-Endian as described in another post. I tried using the big-endian version, the name of the disk ("Mac OS"), to no avail. Any suggestions? Am I using the wrong Hex info? The OS is on an APFS volume, if that makes a difference.

Build:

High Sierra 10.13.6
Z170X-UD3
Skylake i5-6600k

submitted by /u/ritzbitz00
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