The 36 is much more punishing to shoot. If you need thinner, go with a steel frame like the Kimber 1911s.
I don't know about that. I've heard mixed reviews on the subject. The one I shot didn't have much additional recoil. However, I can see how the thinner backstrap would increase felt recoil for some people.
I prefer (and recommend) the original 30 over the 36 unless you have really small hands anyway. Moral of the story is, "Go rent and test fire any gun model you are interested in carrying."