This may not be Z related, and it may not help but... On my Jeep I once had a steering issue and it was like it was binding. Best I could describe it was like the power steering would go out mid turn for a very split second, and then all the sudden come back. Didn't find anything rubbing, couldn't find anything obviously wrong, so I ordered a new power steering gear box. Put the new gear box in, same problem. Went to remove the steering shaft, as I figured it had to be in the column now, and this time I found one of the U-joints was binding in the steering shaft. New steering shaft, and it's been perfect ever since.
Now my Jeep had a reason to have bad U-joints in the steering shaft (its been wheeled), your Z, probably not so much.... But still something else to look at (think about).
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