I am having this same problem!! I was told to cut the bottom 1/3 to 1/2 of the roots off. Goes against everything we know about orchids, but apparently Cyms need this done. After the cutting is done it will hopefully make things easier. I haven't done mine yet, though. I am dividing mine, so I have to wait for pots.
Good Luck. I'm sure CymLadye will chime in with help. She is the resident expert.
You can't be let down if you don't expect the world. ~311