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As it turns out the "Shrink" noise was coming from the left front wheel.
The rotor was rubbing on the edges of the thin sheet metal backing plate that sits behind the rotor.
I could see where metal had been hitting, but could find nothing particularly "out of whack" so I gave it a few judicious whacks with a small ball-pein hammer and that seems to have solved it.
Well... mostly. I still hear it a bit, but it is all but gone. It may take a couple more whack-sessions to completely smooth out whatever was hitting but at least most of the noise is now gone.
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