minimum cable setting on the TV cable is important if the 'fail safe' check ball is in the valve body. This check ball is larger than the other .250 sized check balls.
The trans in fail safe mode will operate at full line pressure, shifts will be late like WOT . You seem to describe this symptom
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.