I forgot to mention that the roots on the shriveled/dead p-bulbs still seem ok. They seem to have stopped growing but are still white. Don't know if that makes a difference as to whether to cut off those p-bulbs.
Also, if I do cut them off, the rest of the plant is practically rootless. In that case might sphag and bag help? Is it possible to get new roots to grow from old p-bulbs?