That old Colt is a beauty! Shooting it had to be a true joy. I am sure that you know this already, but Wolff springs offers "calibration packs" of springs in different weights for a very reasonable amount of money. I would bet that you could find one that will work well with your soft loads and others.
I used this pack of springs when I was trying to get reliability out of my 1914 Colt 1911 with some soft loads(200gr plated RN with 3.5-3.7gr of bullseye). It really worked out well for me, and I don't have to worry about over stressing that old warhorse.
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