Yes, I did rotate and re-balance the new tires, there was no change.
The shudder may not be noticed during moderate to heavy acceleration because the car passes through the 22-25 mph range very quickly.
The trany fluid is clean/translucent.
I need to run your other suggested shifting tests. However, it appears that the shudder occurs in either 2nd or 3rd gear in D depending on hill grade and acceleration; I'm still checking this out.