My shop (Autoscope in Dallas) mostly fixed it. I had them look at it again since the noise was at its worst when the car was fully warm. They ended up going over all of the hoses and insulating it from the body/frame with foam insulation and something else (maybe felt? I can't recall now).
Now, the whine is there when the car hits 180 on the gauge, but it's very distant and mostly quiet. You would mistake it for a slight gear whine and passengers don't notice at all.
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