Quilting, like dancing, is an acquired skill. Even people who are great at it still have to practice. I think what worked for me, was to stop going for consistency. Sounds silly but it makes my quilting look better when I embrace the mistakes and use them as a jumping off point to do something else. I've only recently got into blending the 3 motifs that I know best and it looks ten times better than any of them do on their own. I love watching the long arm folks on youtube. It really helps me to grasp the "free-style" idea behind "free motion".