Here is a picture of how the stem is set up.
I measured the effective top tube on the 57 bike I had been riding and the top tube on the CC is actually about 1/2" longer. But looking at CC geometry if I went to a 56 the top tube length doesn't change much (only 0.4") but the seat tube goes up almost 1" so I probably wouldn't have an issue riding a 56. But if I can adjust this bike to fit me I would rather just keep it. I had my girlfriend measure the stand over last night and I actually clear by almost 2 1/2" but I am confused because this is a cyclocross style frame and I have read that 2-3" stand over is ideal for cx