Someone please correct me if I'm wrong, but I think the 'wobble' stitch is a very narrow zigzag - like 1.0 rather than the standard 3.0 width. This produces a stitch that is almost a straight stitch and is most often used when doing a stitch in the ditch.
I love the sparkle this gives your block as well as the embroidery stitches on the other half of the block. The block would look great with these alone, but your bloom embroidery will truely make this a fantastic heirloom.