Beautiful quilt. I love the stack and whack technique for the dramatic outcome. I've used it for Dresden Plates.
I can see some of the quilting in the close up photo. You did a really nice job. Did you have trouble with the center of each block wanting to shift around or buckle up? That's been a problem for me before with s&w and stars. I start quilting in the center of each and work out. Is there a better way?