Small update, well first of all i have to say that i was not a believer in breaking-in, well i do believe that after a few minutes the stiffness of a transducer will loose up but an inprovement in sound ..mmmmmm not really.
but i have to say these 400i today after an other 7hrs of constant music playing they surly sound a bit better and the low end in more present, still not to what i would like but pretty them close.
so i decided to try the mod sugested here, i cut a thick folder paper close to what the picture showed and rounded up close to the 400i cups (still needs fine tuninig).. did it work ? i would have to say that indeed it increased the low-end and now the 400i with breaking-in and the mod are very well balaced for my ears , they do not have the sub-bass that some times i prefare for a fun listening, but i am not sure i want them too now. i think they are very very close to a perfect balanced sound for me and for the 90% of music that i listen ( RUSH-SUPERTRAMP ) these are getting great by the hour.
i would like to thank DAVIDA for his mod suggestion.
one more thing , i would like some advice on a very good leather pads , will the ZMF pads fit the 400i or something similarly of good quality.
Try the Dekoni TH900 sheep skin pads, very good quality but they get a bit hot for me here in Hawaii. They are slightly angled and a fairly close match to the Focus pads in sound, some may like it, other might not.
Got them off Massdrop for $39 IIRC