well I took a chance with my plant last night and repotted it into a 3.5 inch plastic pot with a 50:50 bark/sphag mix.
It really wasn't showing any improvement since last July so I figured fresh moss and some bark to improve air circulation and maybe dry out a little faster will jump start it.
Still on the sheltered east-facing shelf in the bath and getting misted daily with rain or dehumidifier water.