A good way to water bark potted orchids is to soak the pot for 10 min or so. That way it's fully wetted and speeds up the process of getting new bark to absorb water well.
This was my problem with bark, it didn't re wet very well and I don't have time to soak, so turned to husk and learnt how to water all over again!.
This goes for any change in mix as already stated.