OrchidTracy, I started a new thread with your question; that's why it's here and not on the tail end of the other....
Phals will put out new roots during the active growing season--spring, summer, and early fall--about the same time they're putting out new growth and starting to spike. Once they've bloomed, it will look like they've gone into suspended animation where they will do absolutely nothing for a while.
I don't know what your lighting or temperatures are like but, if you can keep good light on them and grow them at around 75 F, even during the winter, you can simulate a "year-around" growing season. Given that criterion, to initiate new root growth, you can dust the plant's stem between the second set of leaves from the bottom and the growing medium with powdered Rootone or another type of root stimulator. Then, wrap the dusted areas with a few strands of sphagnum and mist that daily, in the morning, to keep it moist but not soggy. In about a month and a half or so, roots will begin to appear through the sphagnum.
This won't work, however, unless you can keep the temps and light up and strong. A couple of customers who had over-watered have tried this and have had good results, so it's worth giving it a shot if you're willing to go to the trouble.
As far as the roots looking good, and then mushy, and then good again, are these roots exposed so that you can see them? I'm assuming you're not constantly unpotting to check their condition, which would put a lot of stress of the plant...
Good growing!