Suspension Help Please (Need to Jump Higher)

[motophreak]

Hey guys. Can anyone suggest some tweaks to the suspension to get more upward pop. I ride a 450, and I can hit some pretty big lines sometimes, but then I see guys on 250s hit bigger lines effortlessly. It seems like I've sort of hit a plateau on what I can get out of my suspension, but I know it can be better. Any suggestions would be much appreciated.