One simply aatrox change/buff.
I think his kit is fine, and no real buffs need to happen, he should even out as people master him, and as people learn his counterplay equally. (Not a run on!, it's old english!) That being said, I would really fell more satisfied and it would feel better if he centered on the inner circle after his third Q cast. It's just a small change that should benefit him in fights.
To recap. When he uses his third Q only, it should center him over the ability upon casting. Similarly to how his old Q used to function.