I've had good success with rooting once I started following the advice of a member named Al (his ID on here is Tapla). He has written about the principles of rooting, and the chemistry involved in making roots. Here's one thread that has some of the basic principles described (see post #10 in that thread) -
http://figs4funforum.websitetoolbox.com/post/Could-this-be-my-cutting-problem-5870584?highlight=tapla
There's also a reference in that post... a link to where he describes some of the principles. He has another posting in some thread or other on this site where he wrote specifically about rooting and the chemistry involved, boiled down to a few principles about perched water, exchange of gases (e.g. root formation makes CO2 as a byproduct, and you've got to have a means for that heavier-than-O2 gas to escape because that same byproduct then kills young roots if it is not evacuated from the root formation zone), and the like. I couldn't find that posting just now. (If someone doesn't beat me to it, I'll try adding that link later if I find it). Because of what I learned from his postings, I now pay attention to a couple of things when I start cuttings
a) the "grittiness" of the mix I use (I make sure it doesn't perch water too high, and allows gases to flow through the mix), and
b) I cut air holes in the sides of the clear cups I use, to promote better flow of gases (I don't "double cup" them either), and
c) the obvious variables in the rooting zone of heat (70F or warmer), and moisture (don't let them dehydrate / dessicate the new roots... but don't make them overly wet in a way that rasies the perched water table height either, because if you do then you'll suffocate those new roots by hindering the gas exchange), and
d) for the top growth zone: once there is any green growth starting, I also try to keep humidity up a bit for the tops as well, and at that point I also try to limit the duration of direct sunlight exposure (to avoid burning the new green growth), at least until I'm sure that the roots are feeding plenty of water to the new green growth. (Sometimes I make shade the top so that the bark on the cutting doesn't burn too... depends on the intensity of the radiant energy and whether I need to use that for heat as well).
I hope this info helps... I've used these principles I learned from Tapla's postings with good success, even to rescue a few maltreated and dying cuttings (cuttings that had started by others but been maltreated to the point where they had died back and "wasted" a bunch of their potential energy on a false start). I wish I could find that other posting he wrote... In general I found that learning the basic principles of root formation was much more helpful for me than just learning techniques... it allows me to improvise based on the specific conditions I'm dealing with, which are constantly changing (season, humidity, ambient temperature, etc). To see what I mean, go read posting #10 in that thread I linked, and follow his link from there as well.
I hope this is helpful... (man I wish I could find that reference thread).
Mike central NY state, zone 5
edit: p.s. The fact that you don't really have to pay attention to all of these principles all the time is because so many varieties of fig tree have such high vitality... lots of them grow like weeds and will root just fine no matter how much you maltreat them! But if you're encountering difficulties or are dealing with hard-to-root varieties, then I think learning those principles can be very helpful.