I have a hard time imagining how the sear spring interferes with the slide.
First thing I would do is replace the recoil spring. The recoil spring has more to do with returning the slide to battery than absorbing recoil. Recoil absorption is managed by the recoil spring and main spring. And to a lesser amount, how the frame rails are mating.
Second thing is to check the ammo. Even factory ammo can be out of spec (and you are using factory for at least the first 500 rounds, no?)
The middle finger of the sear spring does push the disconnector up (and puts a little pressure on the slide), but that won't stop the slide.
The only other thing that could cause such a problem is not enough lubrication and parts not broken in to work together.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Former President of the ECPT (Eifel Combat Pistol Team)
Last edited by danf_fl; 04-28-2012 at 10:20 AM.