Cotton batting have small variations. I have always preferred Hobbs 80/20. You might want to draw you lines with FMQ using chalk. It will be easier to follow a line rather than trying to concentrate on your stitch length and figuring out where you are going. Once you have achieved a good stitch consistent stitch length, then try stippling. Remember, to look ahead to where you are headed, about an inch or two down the line. Don't look at the needle because that is where you are.