Your quilt and quilting look great from here. According to the instructors in my guild, just about everyone has a problem with irregular stitching at first on our long arm. Don't get discouraged!
Early on, when I was obsessing over everything, DH took me to an APQS travelling show. It was spectacular. Following my DH's suggestion, I actually looked for errors, and found at least one in each of these fine quilts. We all have problems in our quilting of one kind or another. Last summer, I took 2 blues and a purple with one quilt. The judge correctly pointed out errors I had made.