Dear Ben,
Hi! It’s been a while. This discussion has a lot of pieces. Birth control has not been discussed much. But there is a lot more to Reb Moshe’s opinion than the little you wrote. Even what you posted does not say much about how women should or could approach high birth rates.
What are the three separate: wrong, against the Torah, and disapproved? What you posted only shows one. Probably the third.
And I have been wondering why the science of infertility is going ignored. Maybe you can help me on that one.