I've already had this hunch that cycling FM by steps > Reverse Flourish could be counterproductive when you're in high haste (merit PT situation) in 75, but I didn't have any data (of how JA delay lock up your auto attack routine) to backup that statement.
Now, whether it's possible or not... I'm rather skeptical that they can change the JA delay strictly to DNC only. It may just affect all JAs in general. It feels that they set up a generic minimum value of 1 second for all JA, and they all derive from this blue print with "additional lock time" variable.