Save my phal

[Mothra79]

Okay, the good news is, I got my dendrobium to bloom! It's happy and healthy. The bad news is, my phal seems to be going downhill. I repotted it about a month ago trimming away quite a few roots due to root rot. I also cut the two flower spikes. Since then, the leaves have started to droop, and this morning I discovered one of the leaves has turned yellow. I gently pulled it up out of the medium a little, and there's absolutely no new root growth at all. At that point, it was easy just to take the entire plant out of the medium and takes some pictures for you guys. What do I do at this point? Is this pot too deep for it perhaps? I'm going to soak the roots in some Superthrive while I await some responses. Thanks for all your help! Oh, the white powdery stuff you see on the roots is some fungicide I applied back when I repotted it.