As suggested by Dfariswheel (who is a retired gunsmith), Lengthening the hand by peening was the method to refurbish a worn hand.
If Colt won't work on it (so call thrm first), Try finding Bob Dunlap. He is still around and used to teach how to service Colts when he was the chief instructor at Lassen College school of gunsmithing.
Bob Wright mentioned the sear. One reason why the older Colts had a smooth trigger is because of its sear. A long sear meant longer contact time with the trigger's tail and thus a longer period for the (or more gradual as opposed to abrupt) compression of the V spring.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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