Hey Jarrett,
Any reason why you can't place your figs outside on the patio in September and let nature take care of the rest? As Summer ends and Autumn commences, days get shorter, your day and evening temperatures will drop, and as Winter approaches I would suspect your trees to want to go dormant. Leaves should turn yellow and eventually drop as the plant prepares for it's dormant period. Or, am I missing why you can't put plants outside? From my experience, the temps don't have to drop that much here in Maryland in late Autumn for all of this to occur naturally.
Kind regards