Quan Chi is my pale husband...pls stop, this character is already amazing, don't downplay him, for god's sake one blocked full screen fireball is guaranteed ex rune into whatever followup your heart desires, he's a great character, he should be exactly as he is. His air fireballs are meant to counter forward momentum, not to just hop in the air 20 times a match, he ain't Akuma, and hell, Akuma players don't even do that because that just doesn't work.
He has flaws, that doesn't mean he needs any buffs, people need to adjust playstyles.