Hi,
So you have a grow-light system setup inside with heat and humidity control .
I would go with 1 liter pot with compost from the nurseries with a handfull of pine bark at the bottom of the pot.
And let them grow .
As suggested, doing this outside (in a 3 liters pot at spring or summer time), here at least, is far more easier as who ever does it, is controlling all the parameters to fit the needs of the fig cuttings in a really nice way.
I rooted some 15 in July, with great success and no hassle or fungus gnats or messing up my flat.
100, that's a nice herd ! Just space them enough so that they all don't get shaded .
Good luck !