I recreated the installer image as per https://www.tonymacx86.com/threads/guide-booting-the-os-x-installer-on-laptops-with-clover.148093/ and replaced the EFI directory from your repo (DELL-XPS-15-9570-8950-4K-macOS-Mojave OSInstaller/EFI). I entered the installer successfully, deleted the original macOS install (recreated the APFS partition). Installer successfully created the new recovery, filevault and macOS partitions but fails to finish, getting a kernel panic.
I'm thinking about going back to the Unibeast method and trying to at least to install macOS successfully again. At this point I'm a bit lost on what may be going wrong here. One thing I was thinking about is that 10.14.3 has just been released and my new installer has that version. May it be the source of the problem? (Previously I installed macOS using the Unibeast method with 10.14.2).