Please balance kayn

I am almost rank 6 with kayn and honestly i enjoy his mobility as assasin (i dont play darkin often) but his damage is severely lacking while his darkin form has insane heals. Im not asking to break him, just to twitch so both forms are equally playable. Honestly his assasin form is OP only when fed, but the same can be said of most champions. His ult does offer utility but is severly lacking in damage. The one good thing the assasin form has going for him is the ganks but most of them get away without another chanp helping you. He is not a xin,ww,yi, even zac has ult that is extremely useful. Just my thoughts on all games i have played as assasin.