Update on my TSB, mostly in town driving... again, seems better but not significantly so.
However, this past weekend I took it up on the Interstate and starting at about 60 there was a 'whistling' sound.
It wasn't the mirrors or the windows as it never made that sound before... I played with the climate controls and adjusting fan speed, toggling between regular AC, MAX AC, Recirculate, and AUTO.
Nothing changed the 'whistling' sound... but, once I turned *off* the AC, the sound went away. Tried it a couple of times and every time the AC was on, the whistling would return.
Truck was returned to the shop and apparently it is a bad blend door that isn't closing properly... new part on order and I should have the truck back by late tomorrow or Sat.
I guess we will see if this bad blend door was also contributing to my perception of the AC only working marginally better.