personally i don't have one in at all. i left the ROF at default and changed the dwell, i dunno what to, i just shot until it wouldn't cycle any more, then went up 15ish clicks.
You can get good results with any number of different combinations, the best way to figure it out is just get a full tank of air, go outside and mess with it.
82nd Airborne Pathfinders, D-Day: 2010-13
Georgia Tech Yellow Jackets, NCPA: 2010-13