Originally Posted by
sonicbum
I was under the impression that Vref reduction came from the higher CONF FULL angle of the NEOs compared to the CEOs but as You mention the GSmini factor reduction as well is likely to support the theory of something that was not developed at CEO stage.
In flaps full Ceo IAE flaps full has 40° flap and Ceo CFM has 35° flap but Vref is same. However GD speed is different IAE it is GD= wt×2+80 while CFM is wt×2+85. Even CFM leap(neo) is same.