Man... fire/kin doesnt need anything. It was a viable farming choice before AE, IO's and sets were a thing and it remains the same. Old school farms were freakshow and the valkyrie mission.. if you soft cap s/l family farm is the best.
It's all about chaining and priority. Flash fire, fire cages, FS, fireball, all the kinetics fun to get you back up to full health and end, stack siphon speed like it's your job,, kill the mob/group, pop any inspirations that are relevant/unnecessary. Next group you need to jump into and use cinders, fire cages, FS, fireball... kinetics as needed.....
If you are going fast enough the tertiary group demands that you use inspirations to kill them, as you wont have any hard control powers to deal with them.
You survived the third group? Flashfire will be up.for.the fourth. It isnt? Congrats... you have reached the highest echelon of fire/kin farming. Your name will be added to the millions of gold farmers that spammed PI during live. (Seriously though.. good job)
You want 20 FS up at all times, 2 siphon speed minimum, enough end for transference every mob, and hasten on auto. You should be able to start farming with SOs at 50.
Then start building your character and fine tuning them.
My live fire kin had garbage sets (none of them) and farmed just fine until AE became the way to do it.... and was profitable enough to kit out several 50's while still being viable for high level content.
TL;DR; You're a fire/kin troller. Cherry pick your mobs and you can solo until you can afford purples. After that, paragon city is your oyster.