When I first started to fmq I thought I had to do feathers, spirals, circles, and stipple. Then I realized it would take me several years of lots of practice for all of them. I don't have the time or passion to devote to many fmq designs. I chose a design that is simple, I know I can do it and it looks great on most all quilt patterns. I save the other designs for the LA's computer. I think your spirals are nice. The stitches are the same size.