So my '16 Denali with 22" wheels and the Bridgestones has never had an issue with imbalance or the awful booming until this morning. The truck now has 9K miles on it and it had been left parked in the garage for the last 4 days. When I drove it this morning, the steering wheel shimmied like crazy, and I experienced the 'booming/buffeting' noise at around 65-75 mph. Hence this issue IMHO is definitely a wheel/tyre issue.
I shall be driving it a bunch from now on, and I'm sure the flat-spotted tyres will return to a more 'rounded' configuration. Hopefully the imbalance and 'booming' will cease. If not, I'll buy the Michelins for the truck as they are such a superior tyre anyway.
Bish