When I say i water depending on the roots, this tends to mean that I water maybe once a fortnight, if that. I do not water that often. I might start leaving it for a bit longer and see what happens.
I wouldn't say I have plenty of new root growth. On the phal with the root rot, I do have a couple healthy roots. It has been about 6 months since I repotted the Phal, but i left a bit of the moss around the roots to that is why I think it has taken a while for the rot to set in. As I said, I am not overly concerned as it seems to still be growing well despite the rot.