If there is no wheel rub, the offset is in spec (you didn't mention the offset above) and they are all balanced, I don't have a clue.
Did you perform a dynamic wheel balance? I've experienced a wheel shudder/vibration around 60-70mph before, had the wheels re-balanced (Hunter balancing unit I believe) and the noise went away. There was no shudder/vibration at the lower speeds.
Sorry I couldn't help you more.
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