Healthy Paphs are not easy to overwater to the point of root rot unless the old medium is very decayed. I don't remove old roots because I can't tell which are dead. I would stop the misting. Orchids don't absorb water through the leaves, and misting promotes fungus.
Edit: After seeing your photos again, the plants themselves look too good to have been sitting on top of dead roots. What did you see that made you unpot them and cut off the roots? What did the roots look like?
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