WP-Supersized image stretches on iPad portrait view

Hi,

I have a WP-Supersized slideshow with landscape images. I have the Fit Image set to Fit Portrait and when looking at it on iPad, vertically, the images fit the screen width AND the screen height, which stretches the images. What I’m trying to achieve is to have the images (when looking on an iPad in portrait view, vertically) fit the height but to allow the images to exceed the screen width, so that the images do not get stretched.
When I choose Fit Landscape, the image crops to the width, leaving black spaces above and below the image.
Fit Always leave blank spaces on widescreens or horizontal view.
Always Fit Screen also stretches the images with the iPad vertical.

Does anyone know how to allow the images to keep the images from stretching?

Thanks!