i use a walking foot a lot but with a bit longer stitch to help prevent puckers. not 2.2 but 2.4 or 2.6 maybe. you might try that. and start near the center and work to the side under the throat of the machine. that makes it a bit easier.
also hold onto the quilt, press or gather in hands and hold on either side of the foot while quilting. making the quilt area as flat as possible. it's not too hard so don't over think things. I spray baste often and it does make it a bit stiffer but not bad. washes out soft again. I like spraying since it helps the quilt lay flat. good luck.