Idk why, but I feel like I found the holy grail of Aatrox builds.
Black Cleaver into LW rush into Steraks. Unless you are Tahm or Garen, no amount of armor stacking can shut your damage down, and you can pretty much instagimp adcs even late game. Keeping % pen this high was a mistake lol. CC and (sometimes hybrid) burst are the only things that can bring you down (even though cc is a general weakness for many champions). Even with a inconsistent sample size across accounts of varying mmr (mostly on the high end MMR), it seems to perform very well consistently vs the normal builds.
Funny part is that I tested this build back when Aatrox was intially released, and I saw a good bit of potential with it. Now it seems the cards have aligned for this to work all the sudden.