The safety plunger can have timing issues (not fully retract in time) based on slide speed. I had that issue with a colt rail gun that I had changed recoil/mainsprings on. If it was a series 70 that wouldn’t have been an issue. Granted that was an IDPA gun that I tuned for reloads with much lighter springs. But I just don’t see the benefit given the potential for headache. Just google “colt series 80 timing” and there is a bunch of info on the matter.