Thanks for the advice kyry! Your bird of paradise is looking awesome :)
I was watering in place (not in the sink) every 7 days with a pint-glass-and-a-half of water, but I think I might try to lengthen the period of time between waterings and give it a better soaking.
And I actually didn't put any rocks in the bottom during repotting after reading that using rocks to increase drainage is a myth (really goes against everything my mom has ever taught me, and I'm still second-guessing that decision haha).