A couple suggestions on how to balance Darius.

So, here are my thoughts.

1. Reduce his level 17 damage to +10 from +20. Do the same for his level 18 damage. It makes no sense that he suddenly goes from 160 damage at 16, to 200 damage at 18. That last two levels spike his damage way higher than any other passive. Reminds me when Yasuo's shield used to go +60 and then +70 at the last ranks, made no sense. That'll reduce his total passive damage to 40-180. That'll be a hit to his late game. -20 damage at level 18 would be -28 damage to Q, -28 damage to W, -30 damage to R, and -6 damage per second on passive.

2. Reduce his slows to 80%. While it won't have a noticeable effect against most enemies (since there is a minimum move speed) people with slow resist or very high move speeds will be able to play against him a bit better.

Since Darius tends to be needlepoint balance, with his swaying too far in either direction, you're gonna have to be pretty damn careful on how you nerf him, or he'll be right back in to the 43% dump truck.

A couple suggestions I have that are more weird and not really meant to all be implemented:

1. Reduce his slows to 50%, but increase the duration to 1.5 seconds. That will make it easier to overlap the W and E slow (they don't stack, remember) and harder to use them perfectly, giving your opponent more time to escape.

2. Reduce his heal to 10% per champion again, but let it heal in the hilt. This will let certain matchups be winnable (Olaf, Fiora) but will weaken his matchups against champions that can't get in the hilt or are too big to (any big champion, Reksai, Shyvana, etc.)

Overall I feel his winnate is artificially inflated right now due to many people using the "chase singed" tactic against him, not realizing that simply following him around while he heals with Q and has 5 bleed stacks on you is a surefire way to die. It's also inflated by people generally assuming he's a weak champion or bad at 1v1s still and trying to just all-in randomly and failing.

Do my two nerfs, DO NOT DO ANY FURTHER BUFFS. No Flash Q buff, no W reset buff. Flash Q would make him WAY too potent in my opinion. Right now he's a little overpowered but not broken tier like some other champions (Skarner, Fiora, Vayne, etc.) Also, take complaints with a grain of salt: His winnrate undeniably goes up as you tier up. That's not for discussion. His lowest winrate is at bronze, his highest winrate is at masters+. EVEN NOW his winnrate at Bronze is 49%. Watch his winnrate after my 2 nerfs, I bet you it sits around 51%. I think that's fine for Darius.