The whole purpose of upgrading a recoil spring kit is to make the gun run smoother. Not just so you can shoot hotter loads. A normal semi auto hand gun, may function beter wwith a increase of 1 or 2 pounds more spring pressure. Wolf springs ,Glock Perfection , or custom shops of manufactures have parts for your gun . Brownells and Midway USA have all the part listed for upgraded springs.
And example let's say you have a 40S&W XDM and the factory spring is 16 Lbs, you upgrade to a 18 lb spring now you gun cycles smoother and you "feel" less sting in your hand while shooting.
Now. You just improved your gun and will be thinking about a trigger kit !