I think I see what you are referring to. Is it the width of the stitching away from the seam? If that is what you are referring to I have a lot of problems with that to but I have learned that when you turn the corner, leaving the needle down, before you begin to sew again, check to see that the spacing is correct. If it is not then I just back out of the last stitch or add one, which ever is needed and then continue on. For the most part this works but you may want to practice on a scrap block to be sure it works for you.