I know what you mean about OOF areas - that is something that I wish we had a better way of dealing with. Right now you need to sharpen each image manually with a mask so you only get the area you want. On certain images, this can be a lot of work. At least when I use 100 or less at .2-.5 pixels it doesn't have a drastic effect and most people wouldn't notice the difference in the background since they never saw it before anyway. However, it can make a world of difference for the subject of the photo.