I have them and have played with the adjustment myself. I get brighted every now and again and it's because when they originally installed the projectors the rotation is off slightly, so even though the beams are where they should be vertically, the driver side tilts up to the left, probably getting into some people's eyes. There's nothing we can do about it either unless we "bake" and open the lights and adjust accordingly. That's my issue with them at least.
Also, the horizontal aim is way too far to the left for both sides, and as far as I know there's only vertical adjustment screws. So that's a big reason why we get brighted too.
As for adjustment, I've only seen screws on the back for vertical adjustment, and they're on the outermost corners of the lights in the back, you'll see them it's the only silver screws with a phillips head and they look like they're attached to a wide washer with teeth on it. Best thing to use is a right angle screw driver since you wont have room to use even a short stubby one.