the thing with the "8 man que" priority is that while it does start as mentioned 2 melee one phys range one caster is that it drops that considerably fast for the sake of speed to 4 dps. Also they did mention changes to the party que formula which we still do not know what they are. As for NIN it also did happen to come out before most of the current party grouping changes. IMO the biggest issue atm with lower lvl DF parties is more about overall participation in such across the board since PotD is just way too efficient. Even then when i do decide to do low lvl roulettes though i rarely see more a que longer than 20 ish mins.