TSBs performed and I'm happy!
Dropped the car off at the dealer today for TSBs. After the transmission flash I had in March, the car refused to downshift quick enough to go around someone on the highway without severe delay. It created a dangerous situation.
The dealer performed PCM Flash 18-007-15 Rev B, and BCM Flash 08-07615. One (or both) made all the difference in passing acceleration. If you haven't done it yet, I suggest you do.