Zygos can be challenging to repot with all the long thick roots. I have soaked the root mass for 15- 30 minutes or longer - sometimes returning it for more soaking. A chopstick, or something similar is helpful too. You can poke it into the mass and gently wiggle it around. Do that in a couple places, especially into the center from the bottom. If you have one - the hose sprayer attachments with a jet spray can be very helpful too. A piece or two of old bark attached here or there wouldn't worry me too much, but I do think you should get that old sphag out, and as much of the old bark as possible.
GL
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