Hi Jake,
thanks for helping!
The error comes once i go through the "initial" installation (when i choose language, destination HDD, etc.) and it says it is going to reboot). It restarts (this time i choose from the destination HDD to boot from) and I after a moment I get a "macOS could not be installed on your computer" screen.
Regarding the DSDT.aml, it can be that i grab it from the E6220 bootpack, since the forums indicate that both computers (E6220 and mine - E6320 - are quite similar), but this i do not recall, since the Sierra EFI i put together some time ago.
For the "trying HS" EFI, i got some other guys clover folder (here in the forum) that was working for him. Shall i edit the DSDT then?
I am sure it will help if i provide a log of the installation. I tried running clover in verbose mode, but the messages vanished from the screen quite fast (and the "macOS could not be installed on your computer" appeared)....
PS: maybe useful information: when i installed Sierra i remember it took quite some time to first reboot (some good 10 minutes or more), during the High Sierra installation it says something like "installing... wait 3 minutes" and it reboots even faster....looks to me it is not doing much...
Best,