Yesterday as I was pressing my quilt blocks, I mused about a couple of my techniques, which date back to my clothing making days.
First I set the seam like this (but I don't use any spray starch). This technique actually makes it easier to open the seam.
After I set the seam, I finger press my seam, which means opening it to one side and running my fingernail along the seam. Finally I use the iron to flatten it well.