Only on very rough roads. I think that you just don't notice it with the factory bulbs because the light is so yellow and the HID's burn so much cleaner and the blue tint shows up better and that is why you see the movement. You did nothing but replace bulbs and plug in the converters. So you really did not change anything like the headlight housing. A loose headlight housing will cause true movement of the projected light. Just a guess?
Chad