Automatic Transmission Shift Points

[DonTX]

I know that the automatic used in my model truck has been modified by some to shift better, but I am just plain unhappy with how mine shifts, and would love to hear from others who are happy with theirs.
My problem seems to be only on downshifts. Under load on cruise control, the transmission allows the engine to lug down and I usually have to kick off the cruise when the EGT starts getting in the red. When it does downshift, it is a rather violent downshift which to the best of my knowledge is a double shift our of OD and out of fourth at the same time, violent and roaring engine all at once. Even when not in cruise, it still shifts harshly the same way.
If I try to just shift it out of OD manually at the appropriate time, the same thing occurs, a violent double shift happens. On a Ford powerstroke I had, the shift out of OD was a very gentle effective shift, then the next downshift was gentle as well..
I think mine has some adjustment incorrect, but don't know what a proper working one does, or how to correct mine. Would someone share what THEIR transmission does under load and going up a hill or if they have had the same problem?