This is why I hate Yasuo
His shield is straight up busted, it saved him twice during that combo. Under no circumstance would any other squishy live through that combo from a fed Jayce, but you know why he did? Passive shield that he gets for free, and it refreshes when he ults.
Remove his shield and he will be balanced.
Removing his shield will also change his play style, as he can no longer carelessly go in and trade without taking much damage.