I went for 85% tint or 15% how ever the measure it. It was the one level down from limousine and it was the shade reccomented by the tinter as I wanted it to look as close to audi as possible. I wouldn't go any darker than that.
Yeah it's far too dark and since you can't get the front window's done it looks stupid when the rears are so dark. I can always mail you a pic of mine if you want to see what it looks like.