My Glock 32 works fine with the factory spring with 357 or 40 factory loads. I don't think it's the spring. As others have said, try upping your powder a bit or use factory stuff.
I had a big problem with Glock. My breach face and the firing pin were eroding and when I sent it back to Glock they said I was using hot handloads. I was using only factory loads but they made me pay for a new slide. I was VERY angry! When I called Glock I talked to a nice guy who fent bad but said if they even suspect handloads, they will not warrantee damage. He sent me a bunch of magazines, a Glock tactical light and a 40S&W barrel to try and make up for it. Still angry about it but at least they did something. Just be careful with handloads in Glocks. By the way, still using Cor-Bon, Double Tap and other full power factory loads, the new slide and firing pin have no problems. I think there might have been a run of "soft" breech faces and pins that Glock did not want to admit to. Still love my Glock though.