I decided to let a small edge of lace peek out under the bias trim at the top of the corset. Just enough to tell me "this end up."
Of course the garters already say, "this end down," but you get the idea. I'm still ambivalent about the trim on top but I think most of my problem is the shine. I wanted the garters to be satin and I wanted the rest of the trim to match so shine I got. Anyway, best to quit second guessing and just keep sewing. Tomorrow I'll show the flossing from the front and the back and I'll take photos of the finished corset this weekend.