Ok so apart from these ~30 games, I should be okay... Thank you
@XFlak for your answer.
I don't think I'll investigate more, cause I already tried everything for literally 15-16hours of turning around and i'm really pissed off

At this point, after trying something with neek2o, my main USB port seems now dead and I have to use the second usb port (the left one or bottom one depending the wii position) ==> neek2o claim to be safe, but it really fucked up my wii hardware. Even a nand restore with bootmi can't help now... incredible... but it's another topic...
I'll just use my official copies for the handful of games not working, this will do the trick
@andybadyfu if your usb2 enclosure works better, let me know
