I also stopped by a local Armstrong nursery (I think it is mostly in California) and picked up a bag of E.B.Stone Edna's Best Potting Soil:
http://www.ebstone.org/13_ednas.php
I would say it is excellent for figs! Here is the content:
Contains Composted Fir Bark, Sphagnum Peat Moss, Redwood Compost, Mushroom Compost, Volcanic Pumice, Earthworm Castings, Washed Sand, Kelp Meal, Bat Guano, Feather Meal, Gypsum and Mycorrhizae.Oyster Shell Lime and Dolomite Lime are added as pH adjusters. A natural wetting agent, Yucca shidegera saponin, has been added to help remoisten the product.
It is very fast draining a porous. I highly recommend it, the cost was $5.99 for a large bag