In my experience, intervention can often harm a cutting. For example cutting off callouses. Or, checking and messing with a cutting daily to see if it's rooting yet, then when you go to transplant it into a pot, knocking off a bunch of roots. Or keeping the sphagnum too moist, or not moist enough.
That's why I just moisten some potting mix, wait 24 hours for any excess moisture to drain off or evaporate, stick it in a 1 gallon pot, then stick the cutting in the pot with one or two nodes exposed, then cover with a plastic bag to retain moisture. Put it in a warm spot (~75%) with or without light. In this way the cutting can be left for at least a week, maybe 2 or 3, before anything needs to be done to it. Once there is significant roots and leaves, place it under a light.
That's it. Figs evolved to be propagated this way, so why get in the way of nature?
Yes, there are many other methods that I and others have used successfully. But, if you're having trouble with cuttings, why not try a couple this way and see if it works for you?