Are your source images all of the same size ?
If you hover the src attribute for your images with the Chrome Developper Tools, it will tell you the natural size.
For the smaller images, the natural size is: 292 x 190, 400×260.
For the bigger images, the natural size is: 306×260 (all seem to have the same).
My best guess is that if you crop/fiddle with the size of your images, you might be able to get them at the right size.
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