D400/D8000 incoming...

Shot w my D7k for 2 yrs, and recently changed my shooting to this...and it works better in low light with more keepers.

Select AF-A.   Then go to 9 central af sensors only...they are the cross sensors.  AF-A is important cause it grabs the scene better than C.  And this arrangement is not available in S mode.

I've shot lots of pro events in very low light...and this works better.  For a relatively cheap cam .