Glad you are back! Not too sure about the "sitting on the rear ankle" comment. A stable position is to be 50/50 both feet, aligned head to feet over the ski.

The fin adjustment is science in and of itself. Unless you have caliper and factory specs, I'd leave it (assuming still set at factory spec). The wing is another thing. Personally I dont have mine on. Helps me maintain a nice carving speed and pattern off the second wake. For open water skiing, the wing is not necessary. Mark it, remove and try it. Can always put it back on. Happy wakes!