Hm, could be a few things. Seems like a knocking over bumps so it could be a ball joint, drop link, or weak shocks. If you said you've already tested it for shocks then it's probably a ball joint or drop link.
Could be this too, but usually worn bushings cause noise under braking too, or the car feeling a little floaty at the front. Does the steering feel floaty and/or does the car pull to one side a little,
@Aki Ishikawa?
Also, what's happening at 4:33? Is that the steering making that noise or did you lose traction?