The latest TCU tune update from Stratified Automotive Controls has changes that are limited to accelerating downshift behavior. The amount of pedal input needed to initiate a downshift is being refined. The reason for changing just this area is that the other aspects of the TCU tune have been completed.
The focus of this effort is the upper gear changes, for example 6th down to 5th. This involves some additional trial and error because there are conditions under which it is desirable to downshift to 4th gear from 6th, and others where the TCU should remain in 5th. Establishing a suitable threshold between 6 to 5 or 6 to 4 is more complicated.