@Yomaneki You're using resampled-size scans. The full-size scans are 2079 x 3017, whereas what you're using is 1280 x 1854, almost half the size.
There are 3 options for you to source full-size scans. One is in the RAW gallery, there's an option in the upper right corner above "Torrent Download" called "Archive Download". Click on that, then click on "Download Original Archive" (the left button) to get full size scans. Two is in the RAW gallery, click on "Torrent download", then torrent your full-size scans. The third option is in the RAW gallery, at the very bottom of the page, there's an option that you click on called "Download original source" to download the full-size image. A little knowledge would've save you a lot of headache, as oftentimes in editing, one minor problem gone unchecked can lead to many other problems down the line. This is a perfect example of that, one that I see all too often: not using full-size scans for their work.
This isn't even the first time you've made that same mistake. Several of your other galleries suffer from the same problem. In addition, your files aren't saved in Greyscale, but rather RGB color. Using screenshots from another gallery with similar issues, I'll illustrate how to do all that:
1.) This file's in RGB color by default, circled in green: https://puu.sh/GQDIS/d06e7b5d38.png 2.) Showing you how to change from RGB color to greyscale: https://puu.sh/GQDNH/2f7cec4ad9.png 3.) Discard color data to change: https://puu.sh/GQDOf/353dee9762.png 4.) Now the file's in greyscale, circled in green: https://puu.sh/GQDQw/e918d2f029.png 5.) Using the export to web option: https://puu.sh/GQDSu/8bc322505f.png 6.) Export settings for 32-color B/W PNGs: https://puu.sh/GQDXR/4e507aad3a.png
Your typesetting definitely needs work, but that's for another time. The more pressing concerns are using full-size raws and converting your RGB color raws into greyscale, 32 or 64-color black and white PNGs.