Currently now, Jhin has a lack of keystone.
Jhin currently resides with Lucian, around at a 46% winrate. As Lucian's reasoning can be found with his perma-nerfed status until he is unleashed for a few months like every year, Jhin has a been taking unrelated nerfs for quite a bit.
Precision only gives attack speed which is not beneficial, arcane comet is typically blocked by tanks, Aery was good at the starts, until it was noticed that anybody can use it and be OP-thus nerfed. ...Phase rush is self-explanatory.
Can you give us back some of our ratios, or a keystone that can fit us?
Be
builds his late games is brutal. I will grant you that his ammo system + AS mechanics do require you to treat his autos like spell casts. Yet the free AD per level just gets enhanced further with tempo. If the fight has you using all 4 autos or 4 ulti rounds it will trigger tempo for the 4th.