Kwiltr

I've searched the forum, but the results haven't really addressed my curiosity. I quilt on a Sweet Sixteen sit down midarm machine. (Pretty new to it too) I like the way the quilting pops when the quilt has been quilted with A second layer of batting, I.e. A layer of 80/20 plus a layer of wool. Has anyone had experience with this on a machine other than a longarm? My concerns are: 1) how do you baste your sandwich together to stop the layers from shifting? 2) how manageable was the weight of the quilting while quilting? 3) Is it worth the effort, or is there an easier way to get a similar result with one layer of another type of batting? If so, which batting?

Thanks for any insight any of you can offer on this. My own experience so far is with only one layer of 80/20 in my quilts.