i think you need to stop assuming he's evil and looking for fault, particularly since nothing whatsoever in the text indicates that he is at fault, and look objectively at what's actually written.
a what?
if it was evil for him to speak then everyone in the narrative is evil for not rebuking him: including God.
so far you've made a half dozen accusations against him, none of which hold water, and they were all shot down by the scripture.
the only thing you're clinging to now is 'well he spoke out of turn therefore nothing he says can be right' -- that's not only a non-sequitur but it's not holding water as a premise either, because he tells all 4 of them, answer me if you can - you must choose, tell me, speak up, i'm only speaking because you supposedly wise men have failed and i am full of righteous wrath because i perceive disrespect against my God ((his name means "He is my God")). and not one of them does reprimand him, and neither does God.
if a man speaks out of place in court the judge reprimands him, or the judge is unjust, having no control over his court.
God does not reprimand Elihu. God puts 5 chapters of Elihu's words into God's Word. God doesn't let Satan speak in Genesis 3.
you need to deal with that.