You can invest in a stitch regulator for some sewing machines. Very pricey, but just an idea. I recently tried one and what a difference. Some times using a doddle pad and just trying to make different "drawings". I've tried to quilt feathers for years - taken the classes from some of the best feather quilters and have finally realized I will never be able to do feathers. I'm sure there's a different explanation, but I am better with circle movements than line and angles. Some times having music on helps, some times not. Some times depends on my mood.