urgod'schild2--such pretty fabric! I sew mini's and accuracy is very important. Through lots of trial and error I have learned about what I call the L-R swing. We tend to sew a smidgen too wide at the beginning of the seam and swing in toward the end and make the seam allowance narrower. This combination at the end and beginning of a seam makes the block even more off. To eliminate the L*R swing:
1. Pay close attention when starting and stopping a seam
2. Chain piece using leaders and enders or a scrap piece of fabric.
3. Use a stilleto or close finger placement.