Your batting generally determines the distance in quilting lines. Most stippling is for enhancement. The quilting should enchance your piecing, not over power it nor create the "plain Jane" look. In longarm quilting, I tell customers never more than a fist width apart at any point, regardless that Warm and Natural, or any other co. says 10 inches apart. Even your backing and cotton on top will sag at 10" apart. Talk to those who longarm quilt in your community - most are willing to share their thoughts too.