Hi
I have completely dismantled the gun twice, and all I can say about the hammer spring is it looks original. No way of testing it but I doubt if it's to strong and pushing to hard on the slide. The reason I'm sticking with the ammo is once the gun gets past the first couple of rounds it works fine. If I had a magazine that held one hundred I'm pretty sure after the first three the next 97 would work perfect. This is a huge improvement where a few weeks ago it would foul almost one in three. So I'm heading in the right direction just not quite there yet.
Even a half loaded magazine will act the same, in fact I have tried three different mags. It's the gun.
Thanks, Tom