Mephisto, is your suspension stock? I would set your settings to comp:16 out, reb 12 out, sometimes going harder on comp can help with headshake it depends on the track but everybody usually sets everything to soft. Set your forks down in the clamps and set your race sag at around 100mm, this is to try and lengthen your wheelbase, sometimes it is worth fitting a couple of links in the chain to get the back wheel out as far as possible. This should make it more stable at speed but will make it more difficult to turn in tight corners. If your suspension is stock, try changing the oil and set your air gap about 100mm, use 5wt oil.