What exactly happens after the install, black screen? Error message? You are not supposed to “get back to the installer” because it’s done…
Please try physically detaching the SSD from your PC and try if it boots from USB then. Steps are: 1. Unplug PC from power, 2. Remove SSD, 3. Plug back into power, 4. Try to boot USB.
If it doesn’t work after these steps, please make a new post in High Sierra Desktop Support part of this forum with all info about the PC, also upload USB/EFI/Clover/Clover folder. Thank you and good luck!