Some of the old timers can probably remember who came up with this chart. It seems like the guy said he was around 185. I'm thinking if you're a little heavier, it would mostly be just a preload adjustment. (?) Folks with more knowledge feel free to share please!
For me, I really noticed a difference on bumpy curves; it now is much easier to hold the line, but you do lose a little comfort in the process. Good luck and happy riding folks.