I'm not sure how hard the steel on current 1911s is but I can guarantee that any gunsmith who has put checkering on a 210 will remember it well.
I'm amazed at the accuracy you achieved with a 9mm 1911! I didn't think it was capable of sub 3" groups in 9mm. How do you find accuracy compared to it in 45?
One of the Detonics that Isa has shot is mine, it's a great gun but with the hotloads it likes, the recoil is a little quirky. It's very subjective but I can't think of many 1911 that are better out of the box.
Whatever, I think the 210 and the 1911 are both fantastic and must haves