You have no idea what springs the previous owner put in the pistol nor do you know what modifications he may have made.
Does this Springfield have the ILS locking mechanism in it? If it does, the first thing I would do is replace the mainspring housing with a standard non-ILS one. Also replace the titanium firing pin with a steel one from
Ed Brown or
EGW. Different diameter firing pins are available. .075" diameter firing pins are common in Springfields but there are exceptions so you'll have to measure the one that's in the pistol now or use gauge pins to measure the firing pin hole diameter to be sure you order the correct diameter. Here are the components of the ILS system:
If it doesn't have the ILS system in it, I would replace every spring with new ones from Wolff just so you know for a fact what springs are in it. This will establish a baseline for future spring changes e.g. if you decide to try a lighter or stronger recoil spring.
I suggest replacing the the mainspring (hammer spring) with a new
Wolff 23lb spring.
I suggest replacing the recoil spring with a new conventional
Wolff 14lb spring and I suggest getting a 12lb spring and a 16lb spring as long as you're already spending money. You'll save shipping costs in the long run. Each recoil spring will come with an extra power firing pin return spring so you're covered there.
I wouldn't replace the sear spring unless test firing indicates the need to.
If you determine that the magazine catch spring needs to be replaced,
Wolff offers variety pack so you can use the one that you like best.