I have been quilting some lapthrows on my Brother CS6000i. I use the low loft polyester batting because it is fairly inexpensive and these are donated. But my problem is the machine just doesn't seem to work effortlessly while quilting thru 3 layers and it is even worse when attaching the binding which is 7 layers. The machine seems to be laboring and makes a bad sounding plunk or chunky sound as I am attaching the binding and I can only sew about a stitch at a time. I have tried changing the needle and thread and nothing seems to help. This machine was sold as a quilting machine and came with a walking foot and an FMQ foot so I am sure it was intended to be used for sewing several layers of material together. I was just wondering if this is true of the Brother Cs6000i machine or do I have a "lemon". Do any of you that have this machine have this problem?