Before you all run out and buy a damper try this. Next time it feels like its wagging its head, try moving your weight forward a bit by sliding forward and/or bending forward and lighten your grip on the bars to about as much pressure as you would use to hold a small bird, ie; almost none.
The 950sm is extra sensitive to weight positioning because of the softer suspenders. And the wide bars set you up for over controlling the front end. Like Keith Code says, the bike is doing fine - its usually the rider messing it up.
Dampers are great on dirt bikes where you ram into big rocks. On road and track bikes they are there to stop a tank slapper - not head shake which is pretty normal.
Ditto others advice on fork setup having a major effect.
Confidence is the feeling you have before you understand the situation.