is new in both, and filter recently changed. Thinking possibly trans fluid pump wearing, in that it appears to need rpms to shift. (??)
I have a similar problem. A harsh shift up from 1 to 2. BAM.
If I feather the throttle I can ease it over the 1-to-2 hump then roar through 2nd to 3rd.
Does the Taurus have a control cable that links the throttle body to the transmission? Check out this interesting video: