Good luck with your FMQ. Practice, practice, practice. (try practicing on small sandwiched squares ) Remember FMQ on a domestic machine is NOT EASY. It is very hard to move quilt around and thru the "small" area on your machine. It can be very frustrating and tiring to move the quilt. And because of this your FMQ may not be perfect/even and your back may not lay really flat. Practicing on small sandwiches may be decieving due to easy of moving the small size. I just FMQ a square in a 5" square 90X70" quilt top and it was really hard moving the quilt.Perfect? NO but I was keeping it for myself so it is good enough. Even SID can be hard. Remember the "gallapping horse" rule. If your quilt is laying on a bed the mistakes will not be seen easily except by you. Others are correct when they say washing will pucker the quilt and make mistakes less noticible. Maybe you are too much of a perfectionist and need to "loosen up" your attitude and your stitches.