If you like the feel of the action, but just want them stiffer, I wouldn't change the springs, you very may end up with the exact same situation, or with a feel you don't like, as Jim mentioned. There are two distinctly different springs I've found available, a bigger one and a smaller one. I personally prefer the smaller one, and some prefer the bigger ones, and you can either lighten or make heavier any of them. You make heavier by removing coils, one at a time until you get to where you want. Tedious process