hey nym i'm really thank you!
first i've set the pad sensitivity at 20 and i have to play really soft.. now i've set it to 5.. and it's better

maybe i hit too hard.. i've seen jel (anticon) that seems playing very soft.. he can trigger more pads at time with just one finger.. while i play with two fingers on the same pad.. so maybe is a better habit to play softer.. but with sensitivity..
the point is that seems difficult have a good sensitivity.. i'm not a great player.. but i've played also the real drum.. and i'm not a good player too, but i feel that if i hit in a way the drum sounds in that way not in another.. while here seems i have to hit in a particular way and exactly on the center and hitting harder i can stay almost always at 127 and seems better.. but if i want to give more dynamics the hits are or too soft or at 127
i'm start thinking can be a problem of air gap.. i also had a problem with pads.. when i was pushing one pad the others plays randomly.. and i've sent the mpc to the assistance but they say me they can't see the problem, seems that when they used worked fine.. and they get it for 3 month!!! .. so i'm a bit scared to open it, maybe i can damage it another time..
btw what do you mean for silicon? there is a video or someone that explain exactly how to do that? i don't want to damage anything..