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I use a rule of thumb (picked it up from a couple of old 1911 pro's), that when the recoil spring is about 1" shorter than a new one, then it is time to change recoil and firing pin springs.
I don't use the "shock buffers". They have been known to get eaten up and cause problems. And with my changing spring about every 5000 rounds, I really don't need them.
Your torture test is a testimony on the design. Considering that the average gun owner shoots from 50-300 rounds per year, a 1911 could last a long time.
Thanks for your input.
"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)