LE testing on buffers was extensive. FBI tests showed they should NEVER be used in a duty pistol as when they fail, they go into multiple parts and render the pistol inoperative.
They also CAUSE failures to function as they restrict the full rearward travel, as designed by John Moses Browning. Typical are failure to eject, feed, causes stove piping and failure of the slide to lock open after the last round fired from the magazine. DUH ? The buffer restricts the slide from full rearward lock to allow the slide stop to engage.
Very often, when we get ANY 1911 in with "probelms" we find a shock buff in it.....and it goes into the trash can, where they belong !
For most 1911's..a 18.5 # Wolff spring is ideal. Keep a spare and compare it to the used one when cleaning your pistol. you will see when it has taken a set and is shorter. Replace every 2000 rds for a carry pistol. 4 to 5 thousands rounds if shooting 760-850 FPS hard ball loads/reloads.
You will never crack a frame IF you keep the proper recoil spring in place.
JMHO based upon 35 years of 1911 plumbing !