Zooming to 150% on large PDF does not render sharp image

I love your plugin, it’s very simple. Today I ran into a bug however, I tried to load a large file (a poster-size chart with a lot of small text). The PDF file itself has high enough resolution to scale to 150% and be perfectly readable. But when I put the PDF on my page through your viewer, the image is blurry when I scale to 150%.

How can I resolve it? The small text on the PDF needs to be readable…

I use the following shortcode: [pdfjs-viewer url=https://mydomain.com/path/file.pdf zoom=page-width fullscreen=false download=false print=false]

I have tried two files, one of 2MB and the same file but 13MB better resolution. Both don’t work. Is there some setting I should put in the shortcode to make it show properly?

Thanks!
Judith