If you are playing Jhin, Please consider the following.

Ok, first take a look at this. http://champion.gg/champion/Jhin/ADC

The most used runes as Jhin is press the attack. Not only this is a really bad idea because Jhin has low attack speed, and need to reload after 4 shots, but also because the precision tree gives attack speed as it's choice bonus. Now, before the rune rework, would you seriously run full attack speed runes on Jhin? Aside from the purpose of making a dank montage? This is basically the same thing.

So, what SHOULD you run? It is definitely aery with scorch and manaflow band with a dorans ring start. Not only it gives you poke damage, and mana refunds but your Q hits hard with the AP bonus of sorcery tree and dorans rings ap. Also, aery gives your W a 0.15 ad bonus in a instant! Before there were annoyances when enemies healed up with pots during the DFT debuff. but now that is NOT the case.

And what support you should team with? ...Well there is this certain support that suddenly popped out after the rune rework. http://champion.gg/champion/Xerath/Support It is really fun to channel both ult to orbitally bombard the mid turret from the river.