Jan - YOU FINISHED IT!!! This is the one I saw in that quilt show in Holland I went to a while back! It's fantastic, what a lot of work already and now you're dealing with this. I wish I could be more help but what I know about machine quilting could be written on a postage stamp! Maybe a bit of everything? Spray baste and hand baste really close together? I completely understand why you want to persevere with your backing and agree about the SID. I really hope it works out, wish I was more help, sorry! But I can send you supportive, quilty HUGSSS!!!
K x