I was going to say put a thick pad under that saddle that is not much longer than the saddle skirt, and then put a longer, thinner wool blanket over the pad so that it overhangs the thick pad by an inch or two, and saddle on top. It will lift the saddle up more, and the thick pad will not be hitting the hip, only the softer Navajo type blanket. YOu can get some really pretty ones, too.
are you sure you would not fit better in a 15.5 inch saddle? you are tall, but it looks like you have a lot of room in that saddle, IMO.