I think I may have found the source of my steering vibration from watching that video again. When I rolled it out a few weeks back I had severe vibes through the steering. It was enough vibration to worry me. I realised that I had not had the new front runner tyres balanced. On this test day it was less severe, but still something there.
I think I will have them balanced again first. Then check the front dampers. Look at the front wheels after the launch ??