This is my billionth life cycle.
Try doing a micro-dash after the f2, I've found that I can be less consistent with my f2 and still get both d12s this way.I can hit the F2 pretty consistently to be honest, the problem is connecting with the second D12 after. Basically, based on the height i get the hit, sometimes the second D12 misses, so i was wondering if there was some sort of cue to guaranteed the juggle. Could depend on the hitbox of the character i'm doing it on? idk if the combo is character specific to be honest