So in keeping with my 'Diary' in hopes that I can refer back if I need to, I thought I would update my status on my Dell build and the things I have tried so far.
1. My Carbon copy failed as it seems that it didn't include the EFI folder and no mountable drive was found. Weird though is when re-ran CloverEFI it updated files rather than fresh install. Hence I have lost all known working plist files.
2. I was able to create a Yosemite USB drive using Unibeast and have that currently installed but as of yet have not completed the post-install; first attempt failed.
3. Created Yosemite clover based usb installer based on the OP under UEFI. Have had no success reaching the installer in either UEFI or Legacy mode. Have tried many args and also modifying sample config plist but always end up at the circle with a line (technical name?). I have ensured as previously learned to use dart=0 and nv_disable=1. I have also used -v and it appears as though I receive a KP for Bluetooth?
4. Have decided to not waste a lot of time on Yosemite and have created a new clover based Sierra which I will now work with. If I can't get that going I will resort to using Unibeast.
Not much in the line of questions at this point as I am sure there is going to be a lot of reading, testing and trialing in order to get this going. The goal is to have a fully functioning UEFI Clover-based Sierra system...frustrating part is that I know it can run it as I had it fully functioning before!