I am not sure if it is appropriate to congratulate on the successful breeding of woodlice, Jen!
"Normal" woodlice seem to be much harder to breed than the tropical (white) ones. I have a culture running since some months, too and the birthrate is rather low.
Volland and Friedrich describe in their book "Breeding Food Animals - Live Food for Vivarium Animals" that the number of breedings in the year depends on light (best results with a low amount for 7 hours/day) and temperature (best results with 20-25°C).