Too late to save a drowned phal?

[Flowermama22]

I recently took over a phal from a friend who wayyyy over watered it: roots were rotting away. I cut off the roots that were obviously unsalvageable, treated the ends w/cinnamon, doused the remaining roots w rooting hormone, and gave it fresh potting medium. It’s a fairly large plant and I thought it was a goner, but to my surprise after about a month the roots look much better than I thought they would (see photos). However, the leaves are getting increasingly dark and droopy, so something is still going on. Any advice on what else I might try to save this? I’ve been watering/feeding sparingly while trying to keep it a little extra humid and warm. Thanks!