Originally Posted by BKrenning
Pressing your seams so they nest together, trimming your points and getting a pin right in the intersection of the nested seams at the point will help. If it's particularly bulky at the seams you might have to go very slow or even rotate the wheel manually to keep the fabric from shifting while you sew over the hump. I have to do that with my mechanical machine.
Nesting fixes my problem every time. And pinning on each seam before I sew helps too. It was a learning curve for this new quilter and I think 9 out of 10 match now. I'm not a perfectionist so I'm happy with that!