There's a bunch of springs in the auto pistols and the 1911 has it's share. The hammer has a spring that is empowered by the slide coming to the rear and can be a source of a unreliable extraction when the hammer spring impedes the slide's rearward movement. A lighter hammer spring allows a stronger return of the slide and a stronger extraction as well. Wolff springs make a kit of lighter springs that can be switched with the original spring but the process is like Peter robbing Paul, too light a hammer spring can cause misfires, another dilema just as bad as a extraction failure.
As a side thought, no factory ammo is as reliable as carefully assembled reloads and I would never claim fault to any autoloader without first running it with good loads, just a thought.