@Sebby
Friend of mine wanted to get cheap IEMs, so i found on the local classifieds Chu 2's. With this PEQ Sultan of Swings sound so amazing and airy in the upper range a lot of details popped up. Even that on the graphs Zero and Chu have same bass response, the Zero's bass its so much fuller and deeper, even with the EQ in the lower range the Chu's can't reach them. Probably will wait for the Hexa 2 (Pure), early reviews says they fixed the bass and the IEM sounds way much more "fun" than before, ill gift the Zero's to my buddy.
I might free up the 30hz band and try to fix the FR in other ranges in the future, but for sure i'm certain i can't live without proper treble extension, thanks for all of the advices and time!