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I'm not seeing any difference in 'crops' between the two versions you have posted.
I would try swapping the outermost mat's black with the adjacent red color. So you would have the same proportions of mat space/color. Starting from the photo and working out, it would go white (very thin), black, white (very thin), black (not quite so thin) and red (widest of all).
Ultimately, this will just take some playing around on your part to get the best combination of colors, thicknesses, etc.