Jhin itemisation and runes

Hello! Fellow adc main here. Decided to do some changes in my pool and ended up picking Jhin. Learned him a little and managed to climb from g4 to p4 since he got buffed last patch. Now my question is about the runes and his build path. I pick up dark harvest into squishy comps and fft when they have tanks/ champs with gap closers. II usually run the standard Stormrazor>IE>Rfc, because I feel like it s better than lethality rn. Any thoughts or ways I can improve?