I wouldn't do that.
"Performance Center" is worth whatever the script on the side of the gun is worth to you. I've seen no evidence that PC guns built in the last decade are in any way significantly different mechanically than ordinary Smiths, and quite a bit of evidence to the contrary.
Having recently gone through an M&P 340, I can say there are sooo many sources of suck inside a modern S&W that have nothing to do with the spring, although the spring strut was a mess, too.
One of the inherent advantages of an S&W K/L/N is the fact that the hammer spring is essentially frictionless. It's held at one end and hooks a stirrup on the other, with nothing in between touching anything. That's a better starting place toward smooth than any coil spring/strut assembly can hope to be. And the small diameter pivot pins of the stirrup inherently have less friction than the mushroom head on the top of that spring strut.
I expect you'd be far better off having one of the reputable smiths like Karl Sokol or Frank Glenn go through the guns than getting some non-reversible aftermarket system installed.
If you want to DIY it yourself, get the Kuhnhausen book. It doesn't tell you how to tune it, but it does make sure you have a really good understanding of what can be wrong with one, so you know how to not screw it up.