The settings have the slide size as 900 x 900.
The slideshow has this metadata:
[meteor_slideshow slideshow="email" metadata="height: 900, width: 900"]
The images were uploaded one at a time while creating the slides.
The images are sized in Photoshop at 900 x 900.
However, the slideshow displays images at 700 x 700.
I noticed in one of the posts that you mentioned a video for using "different size slideshows." Have you since done it? That would help, but I haven't found it.
Some of my slideshows need to contain panoramas (short and wide) and some need to contain emails (tall and narrow), such as the one here in question.
Here is the site.