What should i do with Oncidiums repot or not. 6 of them

[Orchid-gurl]

Few months back i got 6 oncidiums from trader joes. They come in Spagnum Irepoted them in to bark / clay-pebbles with some spagnum on top. well the bulbs got wrinkly. I do usual watering check with the pencil.5-7 days or so. took them out and the roots where mushy. So i cut them off. I have them in rehab they are slowly recovering.Now i got 6 more from trader joes Only store i can get them from in my area. same thing they are tight tight packed in 4 inch pots with spagnum. what should i do. ?? try to remove them and pot them in to a different media or keep them in spagnum. Im not a huge lover of spagnum. but also if I try te remove the spagnum the roots are so small i my break them off the moss is so tightly packed in pot. they are in bloom now. Please help me. I have bark, clay pebbles small bark chunky bark and spagnum also have superthrive. KLN. fish fertilizer and bloom and nitrogen fertilizers.