I am making a heart block for a wall hanging. I cut 10 1" strips and sew those into a strip set, then subcut into blocks the depth of the set. I sewed my strips in sets of two, then sewed those together. I pressed carefully, I thought, so as not to distort, but the set came out so wavy that I couldn't cut my smaller blocks. I know that one thing to do is to change direction when sewing strips, which I thought I did. These strips are skinny though. Maybe I don't iron so well ! Any tips for getting it straight.