Thanks for your kind words.
Image scaling is a ratio, with the printed (PDF) version being 1. Thus, the defaut scaling ratio of 1.25 is a 1.25:1 or 5:4 web:PDF ratio. Depending upon your particular setup, you may need to adjust the ratio up (try 2). Again, it all depends upon the relative size of your images in the first place, which was the reason for adding the adjustment. Ultimately, I'll probably add a shortcode to set the scaling for individual images and override the admin setting (we all have images which don't quite match the overall scaling of other images on the site).
Good luck, and please let me know if I may be of further assistance (a link would be helpful).