Plan the quilting from the center out. That way you only have to deal with half the width under the throat. I don't roll unless I stitch in the ditch. Instead I pleat or puddle. I also wear gloves to move the sandwich. Make sure that none of your quilt hangs up on the table or falls off the back. If that happens, you end up with uneven stitches. Craftsy has a good class by Ann Peterson about handling a large project on a domestic machine.