My proposed fix for yasuo
Lower the effectiveness of on hit effects with his Q. Do not remove them, just lower effectiveness. Why? This is why. Top yasuo's highest winrate build doesn't even have a crit item. It does have trinity and fronzen mallet. Both are on hit items. Those items allow him to deal a lot of damage, have high sticking power with the FG slow, and be very tanky. Reducing the effectiveness of the items on his 1st, 2nd and 3rd Q should help bring those builds down, but leave his class cannon mid build untouched.