Just had a similar problem. After taking the stitches out four times I pressed down really hard on both sides as I fed the material under the needle, went slower and got what I wanted. Walking feet, as others have said, are not for speed and I sometimes forget that. Basting spray is fantastic and is the only thing I use now. I always basted using thread, but the spray is easier and holds so well. Just a hint, don't overspray.