You were told they should put adjusted down right? That's because you're using HID's in a housing that wasn't designed for them. Because it's not projectors or a reflector housing designed for HID's it's causing glare. The reason people flash people with similair setups is because this glare is what blinds them.
Adjusting the lights down like you did only moves the glare down. While this is beneficial to other drivers it limits you're field of vision. You've effectively lowered your lights to the point where they're pointed at the ground more directly in front of the car, not at the road ahead. Adjusting back up will bring your visual field back up but cause glare for other drivers.
The only effective remedy is to either retrofit projectors into your stock housing or purchase an aftermarket housing with projectors already installed. The problem is that even some projectors are designed for halogens and not HID's, so it still wont help.
http://www.blindinghid.com/hid...ctors/
This is why anyone who purchases aftermarket HID's should do more research prior to purchase an install.