Thanks for the help! I wasn't setting it to half, I was setting it to 1920x1080 to match "normal" screens it was meant for, though the scaling should have worked fine regardless. I think a mixture of the above troubleshooting wizard results plus setting the DPI and scaling and one CRITICAL step I missed solved it: You have to log out for the scaling to update, at least on Windows 10. After setting all that and logging out and back in again, the CCP displays perfectly normally!

Thanks everyone!