Thanks Dave,
I'm a bit hesitant to do that with the orange trees, as they are somewhat sensitive and aren't fond of being repotted too often. I did repot them all a month or so ago, but I left most of the soil around the roots. I didn't see any evidence of root rot when I did this, but the leaves have been curling and emerging twisty and deformed.
I'm also hesitant to bring them outside yet, since it's still pretty cold here and they're sensitive to drastic temp changes. But I'm hoping they'll bounce back once it's warm enough for me to bring them back outside and in full sun again.
Any more thoughts?