I'm just starting to do machine quilting and have discovered that doing a wavy line (sort of a meander, but not as distinct a pattern) works really well for me. It helps hide any imperfections in either piecing or quilting (of which I have many!). I use a 'fluffy' polyester batting as well. As long as nobody inspects my quilts too closely all is well!
This is a beautiful quilt and whatever you do will only enhance it. I personally would treat it more like a comforter and space out the quilting somewhat to encourage the puff of the batting to take up some of the wonkiness.