Set your machine up and use a ruler to mark a scant 1/4" and tape a gift card down so you have a guideline for sewing the perfect seams. I believe it's all in the seaming. I tend to veer off at the end of my piece so the taped hard has trained me to make sure it's against the card all the way through the seam. Nothing else has worked, drawing a line, no, I need the edge that is tight against the machine to help guide my fabric. I do this with all of my machines so regardless of the width of the dog feeds I get a perfect seam each time. I actually place the ruler under my needle and carefully hand lower the needle to touch the ruler just to the left of the 1/4" mark and then tape the plastic card/gift card down using the wide blue painter's tape.