I do a lot of piping, and am always having to remind myself not to pull on it while applying. Since I'm trying to keep tension on the cord so that it stays in the channel, this can be very tricky, especially when rounding corners. Sometimes I can tug out a pucker, which lets the cord slip up into the piping but I'm not sure how successful that would be on satin; I apply piping to cottons and linens mainly.
But I will echo what others have said: no one will notice but you and the dress is stunning. Wear it with pride.