My Ficus lyrata has finally stopped dropping leaves after I moved it away from the heating vent—took me three months to figure that out

My Ficus lyrata has finally stopped dropping leaves after I moved it away from the heating vent—took me three months to figure that out! I'm still not great at reading the signals, but I've learned it really hates temperature swings. Now I'm paranoid about watering though. Does anyone else struggle with the balance between keeping the soil consistently moist versus letting it dry out slightly? I have nine plants total and this fig is somehow the pickiest of the bunch.