Outer edge tire wear can also be a camber problem...
If you've altered anything on the vehicle, tires, engine size, etc the stock ride height measurements are out the window
Just get it sitting the height you want, and measure to the control arms,not the bumper(they can be crooked) and make sure it is even
also stock alignment specs are NOT what you want for a performance car...take it to a shop that knows how to do a performance aligment job if that is what you are after