D2 double flicks are tough, but as long as you stay consistent and spam algs with them (like the a perms for instance) then you will be fast with them. Do you do pinkie-ring or ring-middle? Because the first one is the best way to do it.
But that's the way you want it. For D2 you want it to move the pinkie with the ring finger, since that's the movement of the flick. Or is there something else I'm not getting.