I have finally solved my problem with the e-brake.
As I wrote before everything was replaced like rotors , pads and expanders but what I did not replace was the set of springs. I could not believe that the spring was so important even if they seems OK. Must have been slack but impossible to notice. So if anyone of you ends up in the same situation , don't be greedy , replace the springs as well.
From now I have full lock when applying the e-brake , even when driving.