you are right mate! I tried to add this "-p c=HANA,d=206" and now the difficult is fixed as i wanted since the beginning of session...
I have noticed that my first 4 gpu run very fast... other 4 gpu have lower hashrate.. and i don't know how to fix it... do you have this problem also? any idea how to fix ?
ps: the normal algo give more voltage than the "old".. now i am sure of this