Colors in Carbon gvim

Hello,

I'm having some problems making my color scheme work in Carbon gvim.   
I use it in Win32 gvim without any problems.  It seems that all  
colors are "rounded" to one of the 16 basic colors on Carbon gvim.   
In my color scheme I have Comment set to #8080cc and Statement set to  
#8080ff, but they show up as the same color (lightblue).  In GVim for  
Windows/Linux they are different colors (comment is more purple-y).

I've been looking through the Vim source, but everything seems like  
it should work.

Interestingly, while in Terminal vim, &t_Co is set to 8, it's  
undefined in Carbon gvim.

Thanks,
James Longstreet