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The adaptive headlamps at least with AHL2 (retrofittable to E9x cars via coding and I believe standard on F Series cars with adaptive lamps) will aim farther down the road and with a narrower beam at higher speeds, and they deliberately aim lower and wider at low speeds. You can see this happen in your garage with AHL2 enabled by toggling your headlamp switch between Auto (which uses adaptive functionality) and regular On. I wonder if the IIHS testing took that into account? That might also affect the practicality and safety of a DIY headlamp aiming since setting it to satisfaction at low speeds could become dangerously high at higher speeds, and you as the driver wouldn't notice that as much.
And to the point about making sure the left and right beam cutoffs align on a DIY, I don't think that's right either. The charts indicate that the lamp farthest away from oncoming traffic is aimed higher to cast a longer beam because it's safe to do so on that side, which is a standard practice even for non-adaptive lamps,so I would imagine that the cutoffs SHOULDN'T align on a wall test even when aligned with the switch in the regular On mode.
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