Slide=0 is pretty old - as well as using EmuVariableUefi
You can get native NVRAM using this SSDT:
https://github.com/acidanthera/OpenCorePkg/blob/master/Docs/AcpiSamples/SSDT-PMC.dsl. This is from the OC repo, but should work with Clover still. This gets rid of the need for EmuVariableUefi and logout hooks.
For Slide=0, it's probably better to use OpenRuntime's ProvideCustomSlide+SafeModeSlide quirks as that will calculate the proper slide value at boot time in order to fit as memory maps can change between boots.
Edit: This also allows some of the security of slide being randomized to be kept as well, though not as good as all slide values being good and boot.efi calculating a random one.