2008 Busa Hardcore Racing Swingarm

I recently purchased this bike and it handles rougher than any bike I have ever owned. It has air ride and if I push down on the back of the bike it springs down and back up, but while riding it is unbearable to ride. Sometimes it will rude good then I accelerate and the rest of the ride is horrible, or if I switch lanes it can affect the ride. Any help will be helpful. What can I look at that would cause the vibration I am feeling.
 
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