Possible Jhin change
I came up with a solution to Jhin's dominance in the meta. (Especially because of his armor pen build.) **His fourth shot doesn't have 100% critting chance. **(The bonus dmg based on missing health remains.) This would make building crit chance more valuable and would decrease the value of Flat Armor Pen. In compensation you can decrease his total critical damage reduction from his passive. (Although I don't believe he needs this.) Just a thought.