Basicwiz, you already have the means to render with Gc in PP 2010.  Everything that you use will not require Gc nodes within the materials.  However, if you use VSS or the Envsphere, you will need to reset their internal Gc to 1.  Why?  Because you will essentially double the gamma from 2.2 to 4.4.  Bad, very bad.  And this is the easier way. 

Unfortunately, you chose a poorly constructed skin texture in the base M4.  If you replace the base shader with BB's VSS skin template, and reset the internal gamma to 1, you will see an improved diiference because VSS is enhancing M4's textures.