[argyllcms] targen for RGB printer

Hi all.
I would like to have some information about how to obtain the best from targen 
when you have to profile an RGB printer (-d2).
I tried some parameters but, in the final profile, I noticed no big differences 
using the same number of patches.

I'd like to have a total of 1500/1700 patches.
I would like to know:
1) Are you using the -G (Incremental Far Point Distribution from fast to good) 
parameter? Did you notice any differences between with or without -G? In my 
(small) experience -G is not giving me better results. Do you suggest to use it 

2) How many white patch are you using? I tried to set -e at more than the 
default value (for example 8 instead of 4) but also in this case I could not 
notice differences in the final profile.
3) I was trying the -g parameter to set some (64) patches with same RGB values. 
Is this helpfull to improve the BW neutrality or not? Do you use this paramter 
when you are genereting a target that will be used to make a RGB printer 


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