I have a Shogun (champion no. 2 tubing, 600 arabesque, 1 eyelet per dropout) that measures 61cm c to c with a top tube that's about 55.5-56cm c to c.
It's taller than you're looking for but I'm local if you wanted to borrow it for a while and see how the size works for you. I was surprised at the tt length when I first measured it. Fun and quick bike but the frame's a bit short for me.