It’s pretty common today for Bubbas to install a lighter hammer spring to improve trigger pull, without realizing the other things that are in play.
For example with any blow back or delayed blow back operated pistol the resistance provided by the hammer being recocked by the slide is a large part of the resistance designed into the mechanism to delay the opening of the breech.
Consequently a lighter hammer spring has to be balanced by a heavier recoil spring. That usually doesn’t happen. Plus as recoil springs cycle they get weaker over time and many 1911s, hi powers, CZ 75s, Beretta 92s, etc end up running with worn out recoil springs along with lighter hammer springs. Bad things happen and the Bubbas act surprised.