Okay guys I am throwing up my hands at this point.  I cannot get the yellow the way I want it.  Maybe I did and just don't know it.   The first pic is of my original yellow.  I then desaturated it.  Didn't like that so added more shine to it on the Spec Map.  Still don't like it.  What does it need?
I also need to tweak the red on the nose art.  Not sure I like this either.
I adopted this one from MachNix.  
ORIGINAL YELLOW:

DESATURATED YELLOW:


