1911Tuner, sorry to tell you that over the life of the gun a too light a spring will cause damage. I've see the cracked frames to backup my "opinion". I have a Kimber Custom (that's the cheep one) that I used / use for competition that has over 70,000 rounds through it and no damage. I've seen 1911s with far fewer rounds with cracked frames because of too light a spring.
Put 20,000 or 30,000 rounds through your 1911 without a recoil spring then come back and tell me there was no damage and I'll gladly eat my dish of crow.
Now if someone wants to run a 12 # spring and + Ps that's their prerogative. Mine gets beat up less and functioned perfectly with a 16 # spring. I do agree that 22 # is overkill and probably would cause FTF with standard ammo.