If it is still rough on the edges take to a DIY shop and see if someone will do it for you. Also did you see the rubber band trick leah Day stops it bouncing. Some people also find it easier to place a plastic sheet below quilt to help to slide and starch the back for the same reason.
The walking foot is ideal for straight lines or gentle curves it doesn't move well enough for free motion. Think it is has arthritis . Practice etc ten minutes every day .