I use the wing adj. like Herp. When the tires wear, i restore the grip using the wing by having it up. There is a difference. However, if you already have a lot of front wing to begin with, you will notice a loss of speed if you don't bring it down on the straights. I think you can make three adjustments per lap (up, down, up or down, up, down). Your engineer does tell you that you have it up and that you could benefit if you bring it down on the straights. He won't tell you to put it up.