On my machine either the installation from usb was sloooooow (booted from usb3 ports ,but the installer locked and had to change to usb2 port) or after clover my usb ports did not work. I am sure I didn't try all the possible flag combinations/workarounds for proper pre-installation usb fix but there is a simple solution:
Just use an hdd instead
I thought my usb stick was dying ,so first I used a fast usb3 external hdd......same slow speed.....and then I placed it in a free sata port and finished installing in ~18 minutes.
Hope it helps!