Put the bike in a straight line facing a wall square on with it off the stand and a rider seated.
Draw a vertical line up the wall on the centerline of the bike and a little higher than the headlight.
Draw a horizontal line the same height as the center of the headlight.
With low beam on, the light should hit slightly lower and slightly to the left of the point where the lines cross on the wall. In their little sketch, it shows the edges of the beam just touching the lines above and to the right of the main patch of light on the wall. This is as close as I can draw it.
That's a good question - I don't know. I do know that most headlights are more to the left on low beam and to the right on high beam. I just put my headlight back in tonight and saw that when checking high and low beams to make sure everything worked.
If in doubt just set the height of the beam as described in Haynes. The horizontal is probably still ok if it was before the fairing install.
My owner's manual has this information, at least with respect to height. Yours may too. Basically,with the bike 10 meters from the wall, with someone sitting on it, the top of the spot should by 9/10ths of the height of the center of the headlamp. They don't say anything about aiming to one side or the other. Aslo, they make sure to disclaim any responsibility for this method outside of Italy. There may be state laws about this. Anyway, the Italian standard should be close enough, I'd think.
I just ride the bike at night on a straight flat road. You can see where the cutoff is ahead of you and I keep adjusting it until the edge of the beam hits the road about 200 feet ahead. I've occasionally reached forward and twisted the light while riding.