if i may, hormone is not necessary for rooting fig cuttings. with some practice, rooting should not be an issue at all. the tricks to rooting figs are providing condition that cutting will root, and not watering it to death.
the reason for rot could be either they were left in wet condition too long, or the cuttings were not ideal. obtaining fresh cutitng will increase your chance of rooting. rooting and moving them into 1 gal container doesn't take all the much skills. but practice is needed. lot of time, the failure comes during initial stage while we are waiting for the roots to come out. if the cuttings are not aired and monitored for moisture in the environment, they can sit in the water for days on end and rot. also, not airing and cleaning out the mold often will lead to mold taking hold and causing further problem.
once the cutting has enough roots and moved into cup or larger container, watering becomes biggest problem. the small cuttings with new roots can't take sitting in the water too long before rotting and dying. water only when it's needed.