I tried installing Guix again, this time I set up swap, an ssh server and went with graphical install, so the config.scm wasn't an issue. I ran "top" over ssh during the whole process and what it tells me is that when the system hung the RAM usage was around 50% and SWAP almost wasn't used.
When I try to install a bare system without X, the installation invariably hangs while copying files to /mnt. When I try to install a system with Enlightenment, the installation invariably hangs while building "sqlite-with-column-metadata".