I did? I guess it's impossible for a buckler to have more protection than a round shield... but I shouldn't have to explain that.
Maybe it was that avoidance follows a curve and 1/2 the protection is not worth 1/2 the avoidance. You can in fact find shields that are worth 0.0% blocking verses your level. Not near your level of course, but it illustrates how sharply the curve drops... or perhaps the starting point of the curve is not zero protection for a L70/80.