New Paphiopedilum Maudiae 'Napa Valley' in spaghnum mo

[tryingtoflower]

I'm new to paphiopedilums and have a repotting question. I've read all the posts I could locate and I'm only more confused. Two of my plants are in some kind of fine bark mixture and are doing well but I 've read they should be repotted yearly. The new plant is in bloom and is in spaghnum moss and I'm afraid of rotting the roots. Should these plants be repotted or left alone? I grow mostly cattleyas, vandas and phals.