If you are getting vibrations through the bars the steering damper won't fix it. The damper is there to control steering head shake if the rider should upset the front end coming out of a curve too hard and out of sorts with the front end, among other similar situations.
Bar vibrations can be stopped of a number of different ways. A lot of old school Harley guys filled the bars with lead shot, others fill it with a liquid rubber that dries, for the cheaper solutions to changing the vibration levels. There are also bar end weights and other useful products that do the same thing. Google it and look at you tube and get some ideas that may work for you. The mechanical vibration dampeners that fit in your bars are easy to make instead of buying them for a hundred bucks.
http://www.vibranator.com/street_bikes_s/23.htm