Thanks for the feedback guys !
Yeah, piano is not an instrument I used often, and I'm still strugle to mix it or to choose which effect I have to applied on it. I used the Piano V from Arturia, and the velocity curve is really weird with this one. At normal gain and default curve I can barely hear what I played and when I turn up the gain a little bit, it start to clip
After some re-listening few weeks after the release, I agree with you, rhythm guitars are a bit too loud ^^
I'm more influenced influenced by band like Russian Circles, God Is