If I have a choice I put the smooth side down then I can see the piecing.
But if I don't have a choice then I use a thin line of Elmer's washable glue
and set the seam with the iron before sewing. I use a stiletto to push the
seam as I go if needed. Since I starch my fabric it usually behaves but I
still check to make sure it's going under the needle the right way.
You can put a pin ahead of each seam to remind you to stop, remove pin
and check. Sounds like a pain but you won't have any folded seam that
way.