If it works now, then, hurray! Keep the goodfight!
On another note, KGP, my man, what I'm about to say makes no sense to me, but.... It is what it is.
I did have OsxAptioFix2Drv-free2000.efi and OsxAptioFixDrv-64.efi (don't remember why...) and as suggested, didn't needed the two, and only the *-free2000.efi to boot properly. Absolutely true. But, when I do reboot the computer, no screen (2 monitors) comes up at the login section (pre login, it still shows the verbose text). If only one monitor is hooked up, it works, and after login I connect the other and everything works.
With both OsxAptioFixDrv, both screens work at boot.
It's one of those things that not make a diference, since I restart it maybe once a month, but, here's the note. It's magic or witchcraft.
I'll do further testing as soon as I kind reboot the machine... again...
Since I didn't read the entire thread, and you can crucify me for that, did anyone managed to put the 3.1 usb-c to use?
My usb-c adapter doesn't seem to work, but, I have a HDD dock that doesn't work well with this machine so... maybe something else.