Here's the EFI folder from my USB installer. SMBIOS section removed. Hope it helps.
Catalina is working great so far. I did have an issue when I switched Clover themes for some reason. I had many failed boots (got to Clover bootloader but would get circle with slash through it when I chose my Catalina install). Went back to "tonymacx86" theme and so far, so good. Cloned to NVMe from SATA and working great.
Note that I installed the basic 10.15 without updates.
Still not working for me …..
I know previously - I didn't use 14,2 smbios but works for you so should be enough to reach the installer at least.
had a look thru your drivers and kexts - you have two memory fixes in there ,typically you shouldn't use both together but again if it works it works
conclusions so far.....
Mac OS Version matters
Ram brand might matter ? need to work with what I have , others will likely be of the same mind
Dell Bios A32 - matching and bios settings compare - mem I/O above 4gb - worth testing with and without
other x99 builds use with and without - one or other may work
Clover version - this does matter - I need to try another
Cpu v3 or v4 & no of cores - use appropriate kext to suit ( cpus=1 boot flag might help some if kext not installed )
Graphics - this matters , my wx7100 may be the problem for me .need to test further
Kexts to Patch - IOPCI patch required
Kernel to patch - i did use specific patches on my previous build so these should matter both pre and post install
config plist - what works for you doesn't for me so need to test further
clover drivers - bare minimum to allow install on any build ?
clover kexts - bare minimum to allow install on any build ?