drag

Well thats one way of describing it alright, i found this article earlier

"First we need to determine if the head shake is occurring during acceleration or de-acceleration (chopping the throttle)
If you find the front end skipping or wandering (seems to be searching for traction) and or starting to swap while under acceleration, you will normally need to add rebound (turn in) or reduce your compression 2 clicks"

Think i'll take her to the pro's and se what they can do with it, the back squats a little also i've noticed on bumps