Went to get a fitting today after three months of lower and upper back pain that never goes away, even when I am not riding for week (though not as bad as when I am on the bike). He adjusted the saddle height very little and the fore/aft of the saddle. He said the reach is probably what is causing my back pain. When I asked if I needed a shorter stem he said no because shortening the stem to where I most likely need it would change the handling of the bike in a negative way. He suggested getting different handlebars, ones with a 73mm reach. The bars that came with my bike are 112mm. I really don't want to swap out the handlebars until I try a shorter stem. I was thinking of trying a 90mm stem first, I ride with a 110mm stem now.
Just to let you know, my bike is a 57, and I am 6 foot tall.