The 22 pound made a big difference in the shooting characteristics of the pistol. While there was more felt recoil, the heavier spring did help smooth things out. The recoil impulse was slower and less jerky. It was easier to track the front sight, and the thing didn't seem nearly as anxious to slip my grip. The distance the spent casings flew was easily halved.
I've settled on the 20 pound spring, though. It is a happy medium. It doesn't increase the recoil as much as the heavier spring, but still makes things appreciably smoother. It still launches brass, but at least keeps them in the same general area. Overall, for my needs, I've found it to be the best combination of shooting characteristics.
I would recommend you give it a try and see what works for you. Springs are relatively cheap, even on my budget. However, I must warn you that without proper tools, putting those heavier springs on and off that captive recoil assembly can be a royal PITA. So if you plan on doing a lot of spring swapping, I would recommend a non-captured recoil assembly until you figure out what you are going to stick with.