Can jungle karthus get a nerf?

Change his Q to deal something like 125% (scaling back to x2 at rank 5) to single target monsters and less damage when AoE to monsters, something that will make his clear actually reasonable compared to other junglers? I don't know how popular it actually is but after facing it 5 times in like 20 games I put him on my perma ban list. He just scales too well and even when you kill him and try to punish him by catching him in his jungle its a massive blow to yourself if you are a melee jg.

If you guys think he is in a fine spot i guess i'll just perma ban him and that is that but it would be nice to see some attention given to him. Don't completely remove his ability to jungle but kicking his clear down a notch so he actually struggles with mana for such a good clear and make punishing him in his jungle easier and less punishing to the opponent would do a lot for him.