You might still have multiple small problems; If cartridges are still feeding high that would normally mean you still need to close up the mag lips a few thou. Also make sure the rim is sliding freely up under the extractor as the slide goes forward--perhaps a bent or mushed over extractor is preventing this.
If ammo does not drop in the barrel, make sure the chamber is scrupulously clean--happened to me once with a gun that would jam once every 30 rounds or so--thought it was clean but really went after it with a bronze brush then JB and Kroil for quite a while and got the gun running. Also check very carefully to see if the chamber face of the barrel is slightly peened by the firing pin from dry firing in the past
First thing I do is make sure the ammo drops in the barrel as advised in this forum. I keep gun well cleaned and lubed. My first problem was high feed, I adjusted mag as advised, and it got much... more