Phal Repotting- Sphag or Bark?

[Cerey]

I bought a phal about 2 months ago, and of course, it was in full sphagnum moss. It's still in flower, so I won't be repotting soon, but I noticed that the roots are starting to get a bit soggy. I was wondering what type of media do you guys suggest I use. Should I buy new sphag and use that, or should I buy a type of bark media? Or should I mix both together? Should I repot in the same pot or buy a slightly bigger one? I know there are many posts out there about repotting but I just want to know what works best for you guys, especially regarding the transition from sphag to bark.
One last question, should I wait for the plant to finish blooming? Or should I save the roots already and repot? It still has one last bud waiting to open.
Any advice is greatly appreciated. Thank you