Here's the thing: Everybody is different. I mean, I am short (5' - 6") and looking at the geometry the xs would never work for me as the 57. 5 cm top tube is just too long. (55cm) is the absolute longest I could ride. Because of my short thighs, a 75 degree seat tube would be better suited for me also.
I just built a frame, and it has a slightly steeper head angle (71 degrees), because I also fit into that category of not wanting "lax" geometry.