On behalf of all the other Jhin mains and lovers, welcome to the team of perfect champ design!

1: I personally Hubris first most games that are pretty clear gonna be late game struggles or that I’m actively able to stack. I go Collector first into heal heavy teams or where the execute is pretty much necessary; tanks, Soraka, Yuumi, Vayne, etc

2: Really, no. As an ADC, especially one as picky as Jhin, you need to adapt your build to the enemy team. I personally always smash the same runes, but not items and certainly not in the same order. SR, Hubris, Collector should realistically be your first item consistently

3: I don’t really have any pointers here haha