The one I use is the one that minimizes the blue cast. The thing is I never got to thoroughly test it myself, I rather went by the opinions of the creator. What is the variation you guys use.

My settings are:

Gam: N
Kne: M
Blk: P
Ped: -4
Set: -1
Shp: -1
HDF: M
Dhv: 0
Cor: 0
NR1: 0
NR2: 0
Cmx: N
Cgn: 8
Cph: 0
Rgn: -1
GGN: -2
Bgn: -3
Rgm: 10
Rbm: -12
Grm: 6
Gbm:0
Brm: 12
Bgm: -3