Thanxs Jugulator.
It takes a lot of support, but if the sound is in the good place, it makes life really easier. The difficult thing for me is to "switch" from a lot of support to less support. As you can hear in the verses, it's near straining .
Strange thing, it has always been easier for me to sing in higher part of my voice than the middle part. I don't talk about the low part, i have no lows lol.
If you or others have some good exercices for support, i'll take 'em all!