NVIDIA WebDriver black screen issues on High Sierra with 750ti, iMac 14,2.

Hi there!

I have my Dell Optiplex 990 set up with High Sierra and a GTX 750ti. It's SMBIOS is set up as iMac 14,2. I have Clover set to inject kexts, and I have tried with both Lilu+NVWebDriverLibValFix and Lilu+NvidiaGraphicsFixup (apparently not needed on my system definition, but I figured it was worth trying. I am NOT running NVWebDriverLibValFix and NvidiaGraphicsFixup at the same time, as apparently this is incompatible. I have EmuVariableUefi-64.efi in drivers64UEFI, and, since my system is a legacy install, I've also tried in drivers64. I have tried installing the web driver with and without SIP enabled, with webdriver 378.10.10.10.25.102. My OS is build 17C88. Are there any common pitfalls in what I have tried? Is there anything else I should attempt?