I cannot FMQ without my Machinger gloves on. Some cotton threads are weaker then others. Try changing to 50wt Aurifil or similar. Use your needle down function when changing your hand position. Don't try to stitch right on the line but look ahead to where you are going. The chalk line will erase and no one will know you didn't stitch exactly on it. I stitch fairly slowly when doing FMQing.