Kayn needs buffs. Badly

In his current form, neither his SA or Darkin forms are really good - we can see this by his winrate. In SA, he suffers from limited gapclosing ability and not getting powerful until late game, which is bad for assassins. In Darkin form, he has no ability to do sustained damage which he needs to kill tanks

Suggestions:

1. SA form should increase the range on his Q

2. Buff the base damage on his ult

3. Nerf Darkin healing but give him %health damage on his autos

Just my 2 cents but I really feel like he's too weak.