I found a workaround:
Specifically, this part at the end:
The it87 driver will now load on boot and your fan speeds will be displayed on the Unraid dashboard, and the fan controllers will be available in Dynamix Auto Fan Control.
Warning: Setting acpi_enforce_resources to lax is considered risky for reasons explained here.
Of course I didn't need the "video=efifb:off" part, so I just added "acpi_enforce_resources=lax" to my /boot/syslinux/syslinux.cfg, then "modprobe it87 force_id=0x8628" to my /boot/config/go. A little risky (see link above), but otherwise seems to be working well so far. Will monitor it for any instability. Just want to share my findings in case someone else finds this post later.