I can't complain. The mold came off cleanly and I wire-brushed the surface. It is what I wanted. Why does it always have to feel so anticlimactic two days out? I think it's the color, and the way that the perlite looks so bright.
The same morning that I cast the new tall, square trough, I also cast an Oslo trough and then a small round planter with the leftover mix. This ugly photo reaffirms that my thoughts about combining shapes are correct. This is the beginning of a nice grouping.