Looks like there is also a crack/groove in the ice that upsets the stability a bit. I have never ridden at high speed (over 120) on a bike, so I am not offering advice from that perspective. I have however encountered many (MANY) ruts, roots, logs...that have caused me some handling issues. If you watch the video back there appears to be a groove that is giving him some issues each time he crosses it.
As for the dampeners, spike length or other characteristics imparted by their existence or lack there of I am learning by reading here.
Anyhow, nice job Anders. Looks like you and the bike are in good enough shape to try it again. Well done!!!!