I rooted two Smith cuttings from two sources last season. One was productive from the start and fruited like it was on steroids. The other one set only a few figs at first; I thought it was a straggler, but a few weeks later, it was loaded, too. I am convinced that, in most cases, it's not what we grow but how we grow it. If your Smith isn't productive, there is something in the growing environment it doesn't like.
A picture of one of my Smith trees last season, about 7-8 months after I rooted it: