Triggerhappy, a flat bottomed firing pin stop is a good idea if you're going to work up some hot loads (you sound pretty familiar with 1911's and may know this already.) This is a common addition for full-house 10mm loads in 1911's. EGW makes them, not sure who else.
I have one in my Para P16-40, it's nice in that it delays lock time a little, and lets you get away with a lighter recoil spring (I don't like really heavy springs since they are hard on the gun too). My P16 handles full house 10mm level loads fine, but still runs with real light .40 S&W stuff. You should be able to get the same results in a .45, with something that will handle Super loads but also work with standard 45 ACP. I have not installed one in my .45 though.