are you using your foot to measure where your seam was? I do. when i pivot, i put the pressure foot back down and see if my foot i'm using is in the right place or not. if not, i raise it again and take one more stitch if necessary.
also when pivoting, make sure you line up your block straight again. that seems to be your problem in your photo. just not lined up right when you begin stitching.
good luck.