Hi Elle,Claes
the culprit was me 
I didn’t apply the calibration curve to icc profile as Argyll creator says…
Now the print is almost perfect, it lacks of deep black but I think is because I did reduce the density because with the default driver setting (Gutenprint) the patches were bleeding each other…
I’ll investigate…
However I’m very happy for the result which I thought wouldn’t be done possible for my little knowledge in color management…
I must say this “not working” let me discover in more deep the color management and ICC profiles structure.
I think GIMP would have to make choose the printer profile into printing process but for now it is good as it is.
I hope to improve more in the future 
Cheers, Ciao
Gabriele