Driver's side I grounded up on top of the radiator support with the AC fan ground point, next to the head light mounts.Where did you ground your HID harness?
Passenger side I went to the side of the engine bay, behind the headlight is a ground point where something else is OEM grounded (I forget what it is off the top of my head)
I tried a couple other places out of sight, right on the frame, but I wasn't getting good grounds.