I have an 08 WR450 and have had some issues with the suspension because of my size and weight. I'm 6'6" and weigh 260. I resprung it with an FC 6.7 on the rear and .50 in the front without much luck. I have been doing quite a bit of research and feel fairly confident about changing up my shim stack. Anybody here have any experience in this? Are there any special tools I would need to do this? Any input would be great.