@JoshuaB - I had the same issue (scratchy on my wrists) with the same skin. Ultimately (and very carefully) what I did was use a very fine nail file and filed gently downward starting at a 45 degree angle and rolling it down over the edge.
I kept doing this (especially on the right side corner, where I was getting a bit of overhang) until it felt nice and smooth. Much better now.
Key is a fine grit, and maybe testing it on a spot of the palmrest skin near the display.