Also Go look at any full-scale airplane, I have Never seen one that has ''rounded'' trailing edges.
I know on a F-16, the training edges are very sharp in relation to there flight control surface size. The trailing edge of most flight controls are in the 1/8" range or thinner. Seen many people receive a few stitches from walking into a flaperon, it is just high enough to be out of your peripheral vision for an average height person.
This seems to work for Mach 1.6...