How can I farm better as Jhin?

So I was looking for the q&a that should have came out Still looking, & any links would be appreciated and remembered something about my first match as Jhin. I ended up going 13/5/20, & although that's good, I was lvl 8 around mid-game, & everyone else was lvl 11 before I started raking in a little bit more minions. I hate to use my w (His beam that stuns if hit by anything prior) to kill minions even if it's hella helpful since it passes through minions, but my q just doesn't cut it. I also hate having to use my fourth bullet for anything other than champs, & when I do use my fourth bullet, his reload costs me a good two minions right there. I feel like his grenade should do very small AoE damage to minions. It's just sad that I ended up getting around 7 kills with 0 deaths early-game, & was so under-farmed my team started passing me in level.

What more can I do to secure minions? I last hit when I can, & use grenade, but I feel his farming is just weak, & needs some help. I really think small AoE on minions from his q (Grenade) would help him It's a grenade after all Riot :/