madmuffin I checked your PSD and it seems that there are simply pixels that appear to be blank but actually have color. I selected the main image portion of the layer that would have large blank areas after export, inverted it, hit the delete key to clean up the selected pixels, and then ran PhotoshopToSpine again and no additional blank areas were created.
In the case of your PSD, it appears that there are some pixels with color in somewhere around the four edges, so if you select pixels around the four edges and remove the pixel, it should work.
