I am shooting football in the daytime with my d700 and I have tried several different combos of AF settings. I shoot AF-C, Ch, and wondered which is best: 21point,51point,3D or Auto. Also, I have read differing opinions on Release or Release+Focus. I have tried Auto and 3D, but wondered if 21 or 51 point were any better. Any sports photographers have a particular combination they have had success with when using the D700?