For even stitches, you must learn how to hit a certain speed on your DSM and be able to move the fabric at the same rate as your DSM moves it. Some quilters find at a higher speed that their curves are smoother. I have always found looking at where you are wanting to go rather than looking at where your needle is may help improve your stitches. One on one class instructions at your LQS may help you get over the hump. We all didn't learn how to drive a car in a few days. Hang in there and keep practicing because it will suddenly all just click together.