That's funny - I was just about to edit my post to add something along those lines.
To the OP, no idea what the factory edge is like on your CX. Maybe one edge is sharper than the other? I tune mine to 1º/1º side/base bevel and keep it really sharp... which is needed in NE hardpack/ice. I use the file as needed when the edge gets dinged up and diamond hone every few waxes.