I asked a similar question recently, and got some good responses.
I've been experimenting since. For what it's worth, I found that I preferred a softer spring than I used to have in the forks for most of my riding. However, on days where I knew I was going to be pushing myself a little more on bigger terrain and specifically, jumps and drops, I wanted to go back to a more firm spring, as Skyline-GTR's response in my thread suggested.
I can only advocate doing the same really, play with your set up until you feel as though you have it right for your style of riding. In doing so, I've found that I've come to understand bike set up a little more which is a good thing too in my opinion.