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Yes, it doesn't work, an AT has enough friction just coasting, DFCO is FOR BRAKING not for coasting, it adds even more friction from engine braking losses and excessive transmission losses since you are also going to be spinning the transmission.
Your best bet with an AT is to surge to speed, let off the gas to coax a shift and press the pedal in just enough to almost maintain speed, allowing it to slowly decay over a period of minutes, then slowly/gently accelerate every time you have a downward section of road to regain the small amount of speed you lost.
DFCO is what you use if you have a lot of stops and are not able to coast to the stop.
Cheers
Ryan
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