Headshake comes from a condition of instability, such as hard acceleration out of a bumpy corner. Classic case would be the rider landing a botched wheelie with the handlebar/front tire turned instead of straight and square.
Move your body position forward and lower towards the tank, use the footpegs as the leverage to do this, not by pulling yourself forward via the handlebars which can exacerbate the condition. Either maintain or gradually decrease throttle but do not roll on more throttle.
Many racers will say roll on the throttle but the motorcycle is already in a condition of instability. Extending the suspension and lightening the front end can possibily add to this condition of instability. And since our goal on the street is to stay healthy and wealthy, not challenge for a podium spot... why risk it? There are no trophies or race purses awarded on a commute or street ride.
Being a racer myself, I have had major headshake before coming out of a cornor and ended up tumbeling/sliding down a straight for about 60 to 70 yrds, if your going to ride hard enough to develop headshake get a damper. The $400 spent on a damper may be the only thing between an expensive crash/hospital bill, and only having to change your undies when you get back home....
Sorry for the long post.