I want to use upscaled backgrounds and sprites

I've used waifu2x to upscale the backgrounds and sprites for 4k use, but as is they do not scale "properly", instead scaling to double the standard size a if they were the original images. I'm wondering what I could do to make them display at the correct relative size, whether I need to edit the config, script, or engine code.

Most coordinates are hardcoded in the script and in the registry (chiru.file). Upscaling to 4K will require updating all these coordinates.