Don't know if you've already assembled the samples, but check the upper right corner block. In A there is one color sequence and in B, there is another. Minor error, but with all this work choosing fabrics and colors, you don't want to discover it later. You should also check your second triad presented later.
I find the contrast between the light fabric and the others too stark in A, but the orange doesn't do it for me either.
I like the color in the 2nd attempt at selecting the fabric in the triad. I know there's not good contrast, but the 4-squares stand out much better and should look good in the full top.