From someone who lives in an area where figs grow in the wild - moisture is not as necessary as warmth. In fact, I let my figs dry out a little, and don't keep them constantly wet - they like a damp, very "airy" soil to let oxygen to the roots, a tonne of fertiliser, and warmth, warmth, warmth. If they are constantly wet, it can be detrimental to their health. I water them a bit like I water my elms... but with a heap more warmth and sunshine.