I'm disappointed with this calibrated step wedge I received in the mail today from Stouffer. I scanned the wedge as a document to show the black spots at steps #1, #2, #3, and #6, there could be more. You can see where I wrote in pencil the density increments between the steps on the step density chart. A differentiation of .14 density and .15 density is not that concerning, but the second half of the wedge density increments are bothersome to me. Am I being too critical of this step wedge?