I gave my NM Classic a try at 5 3/4", but the flight of my arrows wasn't as good as when it is at 6 1/8". With the lower BH, the feathers are touching the riser, so maybe that has something to do with the poor flight. Got it back up to 6" for my next practice session.
I haven't played with the Misty Dawn, which also shoots well at 6 1/8".