First I'll throw out my standard caveat to NOT do a wholesale changeover. It is often better to pick one or two orchids that are putting out new roots and try them. (Switching to s/h culture requires a bit of a shift in your thinking, not just a change of medium and watering.) But as you've already jumped in, I encourage you to wait and see how they do before proceeding.
I don't bother with the cinnamon treatment of rotted roots, I cut them off and am done with it. Remember, the bacteria and fungi that rot roots won't affect living tissue. Death - usually caused by suffocation - occurs first, then the critters can attack the tissue.
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