I do my bindings the way the OP does. My arthritis won’t let me do hand binding, and I don’t like the extra time and fabric needed for a flange. One thing that helped me keep an even width is serging my quilts before binding. It gives me a firm, even edge to roll the binding over. I also found it best if I place my pins right in the seam line, parallel to the edge of the quilt instead of pinning perpendicular to the edge or using a clip.I have even played with water soluble tape and glue. The serger and the pinning had the most improvement in my binding by far.