with the PP: giving supplements during those evening cluster feeds is a good way to end up with poor supply. I just want to address the following specifically:
If you simply allow the baby to nurse, she will eventually get a full meal, even from what feels like an "empty" breast.
A lot of moms start out feeling full or engorged frequently, or even most of the time. But that situation doesn't last. Most moms eventually adjust to make only as much milk as their baby or the pump demands, and when that adjustment happens it's normal to feel empty or flat or deflated- pick your adjective!- pretty much all the time.